Datasheet

AD7870/AD7875/AD7876
Rev. C | Page 4 of 28
ADN7870
1
Parameter J, A K, B L, C T Units Test Conditions/Comments
CONVERSION TIME
External Clock (f
CLK
= 2.5 MHz) 8 8 8 8 μs max
Internal Clock
6
6.5/9 6.5/9 6.5/9 6.5/9
μs min/
μs max
POWER REQUIREMENTS
V
DD
+5 +5 +5 +5 V nom ±5% for specified performance
V
SS
−5 −5 −5 −5 V nom ±5% for specified performance
I
DD
13 13 13 13 mA max Typically 8 mA
I
SS
6 6 6 6 mA max Typically 4 mA
Power Dissipation 95 95 95 95 mW max Typically 60 mW
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−40°C to +85°C; and for the T version is −55°C to +125°C.
2
V
IN
(p-p) = ±3 V.
3
SNR calculation includes distortion and noise components.
4
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 μs/10 μs minimum/maximum.
AD7875/AD7876 SPECIFICATIONS
Table 2.
Parameter
AD7875/AD7876
1
Units Test Conditions/Comments K, B L, C T
DC ACCURACY
Resolution 12 12 12 Bits
Min Resolution for which No Missing
Codes Are Guaranteed
12 12 12 Bits
Integral Nonlinearity @ +25°C ±1 ±1/2 ±1 LSB max
T
MIN
to T
MAX
(AD7875 Only) ±1 ±1 ±1 LSB max
T
MIN
to T
MAX
(AD7876 Only) ±1 ±1/2 ±1 LSB max
Differential Nonlinearity ±1 ±1 ±1.5/−1.0 LSB max
Unipolar Offset Error (AD7875 Only) ±5 ±5 ±5 LSB max
Bipolar Zero Error (AD7876 Only) ±6 ±2 ±6 LSB max
Full-Scale Error at +25°C
2
±8 ±8 ±8 LSB max Typical full-scale error is ±1 LSB
Full-Scale TC
2
±60 ±35 ±60 ppm/°C max Typical TC is ±20 ppm/°C
Track-and-Hold Acquisition Time 2 2 2 μs max
DYNAMIC PERFORMANCE
3
(AD7875
ONLY)
Signal-to-Noise Ratio
4
(SNR)
@ +25°C 70 72 69 dB min V
IN
= 10 kHz sine wave, f
SAMPLE
= 100 kHz
T
MIN
to T
MAX
70 71 69 dB min Typically 71.5 dB for 0 < V
IN
< 50 kHz
Total Harmonic Distortion (THD) −80 −80 −78 dB max
V
IN
= 10 kHz sine wave, f
SAMPLE
= 100 kHz
Typically −86 dB for 0 < V
IN
< 50 kHz
Peak Harmonic or Spurious Noise −80 −80 −78 dB max
V
IN
= 10 kHz, f
SAMPLE
= 100 kHz
Typically −86 dB for 0 < V
IN
< 50 kHz
Intermodulation Distortion (IMD)
Second Order Terms −80 −80 −78 dB max fa = 9 kHz, fb = 9.5 kHz, f
SAMPLE
= 50 kHz
Third Order Terms −80 −80 −78 dB max fa = 9 kHz, fb = 9.5 kHz, f
SAMPLE
= 50 kHz