9258E-AUDR-11/14
Features
●High dynamic range for AM and FM
●Integrated AGC for AM and FM
●High intercept point 3rd order for FM
●FM amplifier adjustable to various cable impedances
●High intercept point 2nd and 3rd order for AM
●Low noise output voltage
●Low power consumption
●Low output impedance AM
ATR4251C
Low-noise, High-dynamic-range AM/FM Antenna
Amplifier IC
DATASHEET
ATR4251C [DATASHEET]
9258E–AUDR–11/14
2
1. Description
The Atmel® ATR4251C is an integrated low-noise AM/FM antenna amplifier with integrated AGC in BiCMOS2S technology.
The device is designed in particular for car applications, and is suitable for windshield and roof antennas.
Figure 1-1. Block Diagram QFN24 Package
Figure 1-2. Block Diagram SSO20 Package
CREG
NC*
NC*
Paddle = GND
AGCCONST
AMOUT1
GND1
VREF4
VS
NC*
AGC1
VREF2
AMIN
AGC2
GND
NC*T
CONST
AGC
AM
AGC
(AM)
AGC
AMIN
VREF1
FM
IN
AGC
IN
FM
GAIN
FM
OUT
GND2
FM
amplifier
81012119
5
3
4
1
2
6
14
16
15
18
17
13
7
23 21 19202224
BAND
GAP
AM
AGC
* Pin must not be connected to any other pin or supply chain except GND.
FMIN
VREF1
GND
AGC1
AGC2
AGCAMIN
CREG
AMIN1
VREF2
FMGAIN
2
3
4
5
6
10
9
8
7
1
FMOUT
AGCIN
VS
AGCCONST
VREF4
AGCAM
TCONST
GND1
AMOUT1
GND2
19
18
17
16
AGC
(AM)
Band
gap
AGC
SSO20
FM
amplifier
15
11
12
13
14
20
AM
3
ATR4251C [DATASHEET]
9258E–AUDR–11/14
2. Pin Configuration
Figure 2-1. Pinning QFN24
Table 2-1. Pin Description QFN24
Pin Symbol Function
1NC Pin must not be connected to any other pin or supply chain except GND.
2GND Ground FM
3AGC1 AGC output for pin diode
4AGC2 AGC output for pin diode
5VREF2 Reference voltage for pin diode
6AMIN AM input, impedance matching
7NC Pin must not be connected to any other pin or supply chain except GND
8CREG AM - AGC time constant capacitance 2
9AGCAMIN AM - AGC input
10 AGCAM AM - AGC output for pin diode
11 TCONST AM - AGC - time constant capacitance 1
12 NC Pin must not be connected to any other pin or supply chain except GND
13 GND1 Ground AM
14 AMOUT1 AM output, impedance matching
15 VREF4 Bandgap
16 AGCCONST FM AGC time constant
17 VS Supply voltage
18 NC Pin must not be connected to any other pin or supply chain except GND
19 AGCIN FM AGC input
20 FMOUT FM output
21 GND2 Ground
22 FMGAIN FM gain adjustment
23 FMIN FM input
24 VREF1 Reference voltage 2.7V
Paddle GND Ground paddle
NC
GND
AGC1
AGC2
VREF2
AMIN
NC
VS
AGCCONST
VREF4
AMOUT1
GND1
VREF1
FMIN
FMGAIN
GND2
FMOUT
AGCIN
NC
CREG
A
GCAMIN
AGCAM
TCONST
NC
24 23 22 21 20 19
7 8 9 10 11 12
18
17
16
15
14
13
1
2
3
4
5
6
ATR4251C [DATASHEET]
9258E–AUDR–11/14
4
Figure 2-2. Pinning SSO20
Table 2-2. Pin Description SSO20
Pin Symbol Function
1FMGAIN FM gain adjustment
2FMIN FM input
3VREF1 Reference voltage 2.7V
4GND FM ground
5AGC1 AGC output for PIN diode
6AGC2 AGC output for PIN diode
7VREF2 Reference voltage for PIN diode
8 AMIN1 AM input, impedance matching
9CREG AM AGC constant capacitance 2
10 AGCAMIN AM input, AM AGC
11 AGCAM AM AGC output for PIN diode
12 TCONST AM AGC constant capacitance 1
13 GND1 AM ground
14 AMOUT1 AM output, impedance matching
15 VREF4 Band gap 6V
16 AGCCONST FM AGC constant
17 VS Supply voltage
18 AGCIN FM AGC input
19 FMOUT FM output
20 GND2 FM ground
FMGAIN
FMIN
VREF1
GND
AGC1
AGC2
VREF2
AMIN1
CREG
A
GCAMIN
GND2
FMOUT
AGCIN
VS
AGCCONST
VREF4
AMOUT1
GND1
TCONST
AGCAM
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
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ATR4251C [DATASHEET]
9258E–AUDR–11/14
3. Functional Description
The Atmel® ATR4251C is an integrated AM/FM antenna impedance matching circuit. It compensates cable losses between
the antenna (for example windshield, roof, or bumper antennas) and the car radio which is usually placed far away from the
antenna.
AM refers to the long wave (LW), medium wave (MW) and short wave (SW) frequency bands (150kHz to 30MHz) that are
usually used for AM transmission, and FM means any of the frequency bands used world-wide for FM radio broadcast
(70MHz to 110MHz).
Two separate amplifiers are used for AM and FM due to the different operating frequencies and requirements in the AM and
FM band. This allows the use of separate antennas (for example, windshield antennas) for AM and FM. Of course, both
amplifiers can also be connected to one antenna (for example, the roof antenna).
Both amplifiers have automatic gain control (AGC) circuits in order to avoid overdriving the amplifiers under large-signal
conditions. The two separate AGC circuits prevent strong AM signals from blocking FM stations, and vice versa.
3.1 AM Amplifier
Due to the long wavelength in AM bands, the antennas used for AM reception in automotive applications must be short
compared to the wavelength. Therefore these antennas do not provide 50Ω output impedance, but have an output
impedance of some pF. If these (passive) antennas are connected to the car radio by a long cable, the capacitive load of this
cable (some 100pF) dramatically reduces the signal level at the tuner input.
In order to overcome this problem, Atmel ATR4251C provides an AM buffer amplifier with low input capacitance (less than
2.5pF) and low output impedance (5Ω). The low input capacitance of the amplifier reduces the capacitive load at the
antenna, and the low impedance output driver is able to drive the capacitive load of the cable. The voltage gain of the
amplifier is close to 1 (0dB), but the insertion gain that is achieved when the buffer amplifier is inserted between antenna
output and cable may be much higher (35dB). The actual value depends, of course, on antenna and cable impedance.
The input of the amplifier is connected by an external 4.7MΩ resistor to the bias voltage (pin 7, SSO20) in order to achieve
high input impedance and low noise voltage.
AM tuners in car radios usually use PIN diode attenuators at their input. These PIN diode attenuators attenuate the signal by
reducing the input impedance of the tuner. Therefore, a series resistor is used at the AM amplifier output in the standard
application. This series resistor guarantees a well-defined source impedance for the radio tuner and protects the output of
the AM amplifier from short circuit by the PIN diode attenuator in the car radio.
3.2 AM AGC
The IC is equipped with an AM AGC capability to prevent overdriving of the amplifier in case the amplifier operates near
strong antenna signal level, for example, transmitters.
The AM amplifier output AMOUT1 is applied to a resistive voltage divider. This divided signal is applied to the AGC level
detector input pin AGCAMIN. The rectified signal is compared against an internal reference. The threshold of the AGC can
be adjusted by adjusting the divider ratio of the external voltage divider. If the threshold is reached, pin AGCAM opens an
external transistor which controls PIN diode currents and limits the antenna signal and thereby prevents overdriving the AM
amplifier IC.
3.3 FM Amplifier
The FM amplifier is realized with a single NPN transistor. This allows use of an amplifier configuration optimized on the
requirements. For low-cost applications, the common emitter configuration provides good performance at reasonable bills of
materials (BOM) cost(1). For high-end applications, common base configuration with lossless transformer feedback provides
a high IP3 and a low noise figure at reasonable current consumption(2). In both configurations, gain, input, and output
impedance can be adjusted by modification of external components.
The temperature compensated bias voltage (VREF1) for the base of the NPN transistor is derived from an integrated band
gap reference. The bias current of the FM amplifier is defined by an external resistor.
Notes: 1. See test circuit (Figure 8-1 on page 11)
2. See application circuit (Figure 9-1 on page 12)
ATR4251C [DATASHEET]
9258E–AUDR–11/14
6
3.4 FM/TV AGC
The IC is equipped with an AGC capability to prevent overdriving the amplifier in cases when the amplifier is operated with
strong antenna signals (for example, near transmitters).
It is possible to realize an external TV antenna amplifier with integrated AGC and external RF transistor. The bandwidth of
the integrated AGC circuit is 900MHz.
FM amplifier output FMOUT is connected to a capacitive voltage divider and the divided signal is applied to the AGC level
detector at pin AGCIN. This level detector input is optimized for low distortion. The rectified signal is compared against an
internal reference. The threshold of the AGC can be adjusted by adjusting the divider ratio of the external voltage divider. If
the threshold is reached, pin AGC1 opens an external transistor which controls the PIN diode current, this limits the amplifier
input signal level and prevents overdriving the FM amplifier.
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ATR4251C [DATASHEET]
9258E–AUDR–11/14
4. Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Reference point is ground (pins 4 and 13 for SSO20 and pins 2, 13, 21 and Paddle for QFN24 package).
Parameters Symbol Value Unit
Supply voltage VS12 V
Power dissipation, Ptot at Tamb = 90°C Ptot 550 mW
Junction temperature Tj150 °C
Ambient temperature SSO20 package Tamb –40 to +90 °C
Ambient temperature QFN24 package Tamb –40 to +105 °C
Storage temperature Tstg –50 to +150 °C
ESD HMB QFN24 Pins 1 to 19, 21 and 24 ±2000 V
Pins 20, 22 and 23 ±1500 V
ESD HMB SSO20 Pins 2 to 18 ±2000 V
Pins 1, 19 and 20 ±1500 V
ESD MM All pins ±200 V
5. Thermal Resistance
Parameters Symbol Value Unit
Junction ambient, soldered on PCB, dependent on
PCB Layout for SSO 20 package RthJA 92 K/W
Junction ambient, soldered on PCB, dependent on
PCB Layout for QFN package RthJA 40 K/W
6. Operating Range
Parameters Symbol Min. Typ. Max. Unit
Supply voltage VS810 11 V
Ambient temperature SSO20 package Tamb –40 +90 °C
Ambient temperature QFN 24 package Tamb –40 +105 °C
ATR4251C [DATASHEET]
9258E–AUDR–11/14
8
7. Electrical Characteristics
See Test Circuit, Figure 8-1 on page 11; VS = 10V, Tamb = 25°C, unless otherwise specified. Pin numbers in () are referred to the QFN
package.
No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
1.1 Supply currents 17 (17) IS11 14 17 mA A
1.2 Reference voltage 1
output Ivref1 =1mA 3 (24) VRef1 2.65 2.8 2.95 V A
1.3 Reference voltage 2
output 7 (5) VRef2 0.38VS0.4VS0.42VSV B
1.4 Reference voltage 4
output Ivref4 =3mA 15 (15) VRef4 6.0 6.35 6.7 V A
2AM Impedance Matching 150kHz to 30MHz (The Frequency Response from Pin 8 to Pin 14)
2.1 Input capacitance f = 1MHz 8 (6) CAMIN 2.2 2.45 2.7 pF D
2.2 Input leakage current Tamb = 85°C 8 (6) 40 nA C
2.3 Output resistance 14 (14) ROUT 458ΩD
2.4 Voltage gain f = 1MHz 8/14
(6/14) A0.94 0.97 1 A
2.5 Output noise voltage
(rms value)
Pin 14 (14), R78 =4.7MΩ,
B=9kHz, C
ANT = 30pF
150kHz
200kHz
500kHz
1MHz
14 VN1
VN 2
VN3
VN4
–8
–9
–11
–12
–6
–7
–9
–10
dBµV
dBµV
dBµV
d B µ V
C
2.6 2nd harmonic
Vs= 10V, 50Ω load,
fAMIN = 1MHz, input
voltage = 120dBµV
AMOUT1 –60 –58 dBc C
2.7 3rd harmonic
Vs= 10V, 50Ω load,
fAMIN = 1MHz, input
voltage = 120dBµV
AMOUT1 –53 –50 dBc C
3AM AGC
3.1 Input resistance 10 (9) RAGCAMIN 40 50 kΩD
3.2 Input capacitance f=1MHz 10 (9) CAGCAMIN 2.6 3.2 3.8 pF D
3.3 AGC input voltage
threshold f=1MHz 10 (9) VAMth 75 77 79 dBµV B
3.4 3 dB corner frequency AGC threshold increased
by 3dB 10 MHz D
3.5 Minimal AGCAM
output voltage
ViHF = 90dBµV at pin 10
(9)
10/11
(9/10) VAGC VS–2.4 VS–2.1 VS–1.7 V A
3.6 Maximal AGCAM
output voltage ViHF = 0V at pin 10 (9) 10/11
(9/10) VAGC VS–0.2 VS–0.1 V A
3.7 Maximal AGCAM
output voltage(1)
ViHF = 0V at pin 10 (9)
T = +85°C
10/11
(9/10) VAGC VS–0.4 VS–0.3 V C
3.8 Maximum AGC sink
current
ViHF = 0V at pin 10 (9)
U (pin 12 (11)) = 2V 12 (11) IAMsink –150 –120 –90 µA A
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes: 1. Leakage current of PIN diode can be adjusted by an external resistor between pin 11 and VS
2. Demo board measurements (see Figure 8-1 on page 11 “Common Emitter Configuration”)
3. Demo board measurements (see Figure 9-1 on page 12 “Common Base Configuration”)
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ATR4251C [DATASHEET]
9258E–AUDR–11/14
3.9 Transconductance of
Level detector ViHF = VAMth at pin 10 (9) 10/12
(9/11) 20 C
3.10 IP3 at level detector
input
Figure 9-2 on page 13,
1MHz and 1.1MHz,
120dBµV
10 (9) 150 170 dBµV D
3.11 PIN diode current
generation
d(20 log IPin-diode)/dU
Pin12
T=25°C, U
Pin12 =2V 30 dB/V D
3.12 Output resistance 9 (8) ROUT 27 35 45 kΩD
4FM Amplifier
4.1 Emitter voltage 1 (22) 1.85 1.95 2.05 V A
4.2 Emitter voltage T = –40°C to +85°C 1 (22) 1.8 2.0 2.2 V C
4.3 Supply current limit Rε = 56Ω19 (20) I19 37 mA D
4.4 Maximum output
voltage VS = 10V 19 (20) 12 Vpp D
4.5 Input resistance f = 100MHz 2 (23) RFMIN 50 ΩD
4.6 Output resistance f = 100MHz 19 (20) RFMOUT 50 ΩD
4.7 Power gain(2) f = 100MHz FMOUT/
FMIN G 5 dB A
4.8 Output noise voltage
(emitter circuit)(2) f = 100MHz, B = 120kHz 19 (20) VN–5.1 dBµV D
4.9 OIP3 (emitter circuit)(2) f = 98 + 99MHz 19 (20) IIP3 140 dBµV C
4.10 Gain(3) 6dB C
4.11 Noise figure(3) 2.8 dB C
4.12 OIP3(3) f = 98 + 99MHz 148 dBµV C
Parameters Dependent of External Components in Application Circuit: RFMIN, RFMOUT
, G, VN, IIP3
5FM AGC
5.1 AGC threshold f = 100MHz
f = 900MHz 18 (19) Vth1,100
Vthl,900
81
81
83
85
85
87
dBµV
dBµV
B
B
5.2 AGC1 output voltage AGC1 active,
Vpin16 (16) =5V 5 (24) VAGC
VS –
2.1V
VS –
1.9V
VS –
1.7V V C
5.3 AGC1 output voltage AGC1 inactive,
Vpin16 (16) =1.7V 5 (24) VAGC
VS –
0.2V VSV C
5.4 AGC2 output voltage AGC2 active,
Vpin16 (16) = 1.7V 6 (4) VAGC
VS –
2.1V
VS –
1.9V
VS –
1.7V V C
5.5 AGC2 output voltage AGC2 inactive,
Vpin16 (16) = 5V 6 (4) VAGC
VS –
0.2V VS V C
5.6 Input resistance 18 (19) RPin18 17 21 25 kΩD
5.7 Input capacitance F = 100MHz 18 (19) CPin18 1.5 1.75 1.9 pF D
7. Electrical Characteristics (Continued)
See Test Circuit, Figure 8-1 on page 11; VS = 10V, Tamb = 25°C, unless otherwise specified. Pin numbers in () are referred to the QFN
package.
No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes: 1. Leakage current of PIN diode can be adjusted by an external resistor between pin 11 and VS
2. Demo board measurements (see Figure 8-1 on page 11 “Common Emitter Configuration”)
3. Demo board measurements (see Figure 9-1 on page 12 “Common Base Configuration”)
IAM sin k
VAMth
-------------------
µA
mVrms
----------------
ATR4251C [DATASHEET]
9258E–AUDR–11/14
10
5.8 IP3 at AGC input
Figure 9-2 on page 13,
100MHz and 105MHz,
VGen = 120dBµV
18 (19) 150 dBµV D
5.9 IP3 at AGC input 900MHz and 920MHz
VGen = 120dBµV 18 (19) 148 dBµV D
5.10 Max. AGC sink current ViHF =0V 16 IPin16 –11 –9 –7 µA C
5.11 Transconductance ViHF = Vth1,100,
dIPin16(16) /dU
Pin18(19)
dIPin16 /
dUPin18
0.8 1.0 1.3 mA/V
(rms) C
5.12 Gain AGC1, AGC2
UPin16 = 3V,
dUPin5(3) /dU
Pin16(16),
–dUPin6(4) /dU
Pin16(16)
0.5 0.56 0.6 C
7. Electrical Characteristics (Continued)
See Test Circuit, Figure 8-1 on page 11; VS = 10V, Tamb = 25°C, unless otherwise specified. Pin numbers in () are referred to the QFN
package.
No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Notes: 1. Leakage current of PIN diode can be adjusted by an external resistor between pin 11 and VS
2. Demo board measurements (see Figure 8-1 on page 11 “Common Emitter Configuration”)
3. Demo board measurements (see Figure 9-1 on page 12 “Common Base Configuration”)
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ATR4251C [DATASHEET]
9258E–AUDR–11/14
8. Test Circuit FM/AM
Figure 8-1. Common Emitter Configuration
FMIN
VREF1
GND
AGC1
AGC2
AGCAMIN
CREG
AMIN1
VREF2
FMGAIN
2
3
4
5
6
10
9
8
7
1
FMOUT
AGCIN
VS
AGCCONST
VREF4
AGCAM
TCONST
GND1
AMOUT1
GND2
19
18
17
16
AGC
(AM)
Band
gap
AGC
SSO20
FM
amplifier
15
11
12
13
14
20
1nF
AM
+
++
+
+
22pF
150nH
100nF
2.2nF
2.2nF
2.2nF
220nF
33pF 15nF
Cant
1µF
1µH
10µF
10µF
AGCIN
AMOUT1
AMINP1 AMAGCIN
GND
FMOUT
FMIN
VS
47Ω1)
4.7Ω
270Ω
56Ω
50Ω
68Ω
4.7MΩ
22Ω
5kΩ
4.7µF 2.2µF
+
100nF
22pF
2.2nF
10µF
4.7Ω
470nF 500pF
50Ω
(1) Output impedance 50Ω adjustment
ATR4251C [DATASHEET]
9258E–AUDR–11/14
12
9. Application Circuit (Demo Board)
Figure 9-1. Common Base Configuration
FMIN
VREF1
GND
AGC1
AGC2
AGCAMIN
CREG
AMIN1
VREF2
FMGAIN
2
3
4
5
6
10
9
8
7
1
FMOUT
AGCIN
VS
AGCCONST
VREF4
AGCAM
TCONST
GND1
AMOUT1
GND2
19
18
17
16
AGC
(AM)
Band
gap
AGC
SSO20
FM
amplifier
15
11
12
13
14
20
1nF
2.2µF
AM
+
1pF
(4)
1pF
10nF
R11
(2)
(2)
(2)
R12
(2)
2.2pF
(4)
C18
C28
C1
C6
C20
C19
C17
33pF C31
C13
C21
100nF
C30
C26 C23
C27 C24
D3
BA779-2
R21
R7
R3
1kΩ
R23
R9
R24
470nH
470nF
220nF
L3
120nH
L1
BC858
T2
180nH
L3
100nF
2.2pF
C2
C29
2.2nF
2.2nF
C5
2.2nF C4
22pF
C3 C7
C10
15nF
C32
100nF
TR1
T1
BC858
64
13
220nF
1µF
C8
1nF
10µF
GND
2. Testing AM + AM AGC
connector AM as input
connector AM/FM_OUT as output
1. Testing FM + FM AGC
connector FM as input
connector AM/FM_OUT as output
(2) Leakage current reduction
(3) AM AGC threshold
(4) AM AGC threshold
(1) AM Output impedance
(50Ω adjustment)
AM/FM application combined with AM AGC
with the following capability
AM
FM
AM/FM_OUT
VB+ 10
+VS
+VS
+VS
4.7Ω
4.7MΩ
51Ω
R2
D1
BA679BA679
D2
100Ω
68Ω
R5
R4
R25
R8
R6
2Ω
RS1
47Ω
R1
100Ω
R10
100Ω
10kΩ
2.2kΩ
R20
33Ω
(1)
3kΩ
(3)
10kΩ
(3)
+
+
+
100nF
100pF
C11
10µF
10µF
4.7µF
4.7Ω
100nF
C12
C33
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ATR4251C [DATASHEET]
9258E–AUDR–11/14
Figure 9-2. Antenna Dummy for Test Purposes
OUTPUT
AGCIN
Gen
1nF
50Ω
50Ω
ATR4251C [DATASHEET]
9258E–AUDR–11/14
14
10. Internal Circuitry
Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown)
PIN SSO20 PIN QFN24 Symbol Equivalent Circuit
1
2
19
22
23
20
FMGAIN
FMIN
FMOUT
324 VREF1
4, 13, 20 2, 13, 21 GND
5
6
3
4
AGC1
AGC2
1, 7, 12, 18 NC
7 5 VREF2
19
1
2
3
5
VS
7
15
ATR4251C [DATASHEET]
9258E–AUDR–11/14
8 6 AMIN1
9 8 CREG
10 9AGCAMIN
11 10 AGCAM
Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued)
PIN SSO20 PIN QFN24 Symbol Equivalent Circuit
8
VS
9
10
11
ATR4251C [DATASHEET]
9258E–AUDR–11/14
16
12 11 TCONS
14 14 AMOUT1
15 15 VREF4
16 16 AGCCONST
17 17 VS
Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued)
PIN SSO20 PIN QFN24 Symbol Equivalent Circuit
12
14
15
16
17
ATR4251C [DATASHEET]
9258E–AUDR–11/14
18 19 AGCIN
Table 10-1. Equivalent Pin Circuits (ESD Protection Circuits Not Shown) (Continued)
PIN SSO20 PIN QFN24 Symbol Equivalent Circuit
18
ATR4251C [DATASHEET]
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18
12. Package Information
Figure 12-1. SSO20
11. Ordering Information
Extended Type Number Package Remarks MOQ
ATR4251C-TKQW SSO20 Taped and reeled 4000 pieces
ATR4251C-PFQW QFN24, 4mm ×4mm Taped and reeled 6000 pieces
Package Drawing Contact:
packagedrawings@atmel.com
GPC DRAWING NO.
REV. TITLE
6.543-5182.01-4 1
04/16/14
Package: SSO20
4.4mm
COMMON DIMENSIONS
(Unit of Measure = mm)
MIN NOM NOTEMAXSymbol
Dimensions in mm
specifications
according to DIN
technical drawings
0.1 0.150.05A1
4.4 4.54.3E1
0.25 0.30.2b
0.65 BSCe
0.15 0.20.1C
0.6 0.70.5L
6.4 6.56.3E
6.5 6.66.4D
0.9 0.950.85A2
1.0 1.10.9A
20 11
110
D
b
e
A
A1
A2
C
E1
E
L
19
ATR4251C [DATASHEET]
9258E–AUDR–11/14
Figure 12-2. VQFN 4x4 24L
Package Drawing Contact:
packagedrawings@atmel.com
GPC DRAWING NO.
REV. TITLE
6.543-5202.01-4 1
05/19/14
Package: QFN_4x4_24L
Exposed pad 2.6x2.6
COMMON DIMENSIONS
(Unit of Measure = mm)
MIN NOM NOTEMAXSymbol
Dimensions in mm
specifications
according to DIN
technical drawings
0.035 0.050A1
44.13.9E
0.25 0.30.2b
0.5e
0.4 0.450.35L
2.6 2.72.5E2
2.6 2.72.5D2
44.13.9D
0.21 0.260.16A3
0.85 0.90.8A
Z 10:1
Z
PIN 1 ID
D
1
6
24
E
Top View
A
A3
A1
Side View
Bottom View
L
b
E2
e
D2
24 19
7
6
1
12
13
18
ATR4251C [DATASHEET]
9258E–AUDR–11/14
20
13. Revision History
Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this
document.
Revision No. History
9258E-AUDR-11/14 • Section 11 “Ordering Information” on page 18 updated
• Section 12 “Package Information” on pages 18 to 19 updated
9258D-AUDR-08/14 • Put datasheet in the latest template
9258C-AUDR-01/14
• Section 7 “Electrical Characteristics” number 1.1 min. values on page 8 updated
• Section 7 “Electrical Characteristics” numbers 1.2, 1.4, 2.4 min., typ. and max.values
on page 8 updated
9258B-AUDR-07/13 • Section 4 “Absolute Maximum Ratings” on page 7 updated
X
XXX
XX
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