AD7870/AD7875/AD7876
ADN78701
Parameter
J, A
K, B
L, C
T
Units
Test Conditions/Comments
CONVERSION TIME
External Clock (fCLK = 2.5 MHz)
Internal Clock6
8
8
8
8
μs max
6.5ꢀ9 6.5ꢀ9 6.5ꢀ9 6.5ꢀ9 μs minꢀ
μs max
POWER REQUIREMENTS
VDD
VSS
IDD
ISS
+5
−5
13
6
+5
−5
13
6
+5
−5
13
6
+5
−5
13
6
V nom
V nom
mA max
mA max
mW max
5ꢁ for specified performance
5ꢁ for specified performance
Typically 8 mA
Typically / mA
Typically 60 mW
Power Dissipation
95
95
95
95
1 The temperature range for the J, K, and L versions is from 0°C to +70°C; for the A, B, and C versions is−/0°C to +85°C; and for the T version is −55°C to +125°C.
2 VIN (p-p) = 3 V.
3 SNR calculation includes distortion and noise components.
/ Measured with respect to internal reference and includes bipolar offset error.
5 Sample tested @ +25°C to ensure compliance.
6 Conversion time specification for the AD7870A device with internal clock used is 8 μsꢀ10 μs minimumꢀmaximum.
AD7875/AD7876 SPECIFICATIONS
Table 2.
AD7875/AD78761
Parameter
DC ACCURACY
Resolution
Min Resolution for which No Missing
Codes Are Guaranteed
K, B
L, C
T
Units
Test Conditions/Comments
12
12
12
12
12
12
Bits
Bits
Integral Nonlinearity @ +25°C
TMIN to TMAX (AD7875 Only)
TMIN to TMAX (AD7876 Only)
Differential Nonlinearity
1
1
1
1ꢀ2
1
1ꢀ2
1
1
1
1
LSB max
LSB max
LSB max
1
1.5ꢀ−1.0 LSB max
Unipolar Offset Error (AD7875 Only)
Bipolar Zero Error (AD7876 Only)
Full-Scale Error at +25°C2
Full-Scale TC2
5
6
8
60
2
5
2
8
35
5
6
8
60
LSB max
LSB max
LSB max
ppmꢀ°C max
μs max
Typical full-scale error is 1 LSB
Typical TC is 20 ppmꢀ°C
Track-and-Hold Acquisition Time
2
2
DYNAMIC PERFORMANCE3 (AD7875
ONLY)
Signal-to-Noise Ratio/ (SNR)
@ +25°C
TMIN to TMAX
70
70
−80
72
71
−80
69
69
−78
dB min
dB min
dB max
VIN = 10 kHz sine wave, fSAMPLE = 100 kHz
Typically 71.5 dB for 0 < VIN < 50 kHz
VIN = 10 kHz sine wave, fSAMPLE = 100 kHz
Typically −86 dB for 0 < VIN < 50 kHz
Total Harmonic Distortion (THD)
Peak Harmonic or Spurious Noise
−80
−80
−78
dB max
VIN = 10 kHz, fSAMPLE = 100 kHz
Typically −86 dB for 0 < VIN < 50 kHz
Intermodulation Distortion (IMD)
Second Order Terms
Third Order Terms
−80
−80
−80
−80
−78
−78
dB max
dB max
fa = 9 kHz, fb = 9.5 kHz, fSAMPLE = 50 kHz
fa = 9 kHz, fb = 9.5 kHz, fSAMPLE = 50 kHz
Rev. C | Page / of 28
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