Changes to Ordering Guide .......................................................... 25
Rev. C | Page 2 of 28
AD7870/AD7875/AD7876
SPECIFICATIONS
V
DD
= +5 V ± 5%, V
SS
= −5 V ± 5%, AGND = DGND = 0 V, f
CLK
= 2.5 MHz external, unless otherwise stated. All Specifications T
min
to
T
max
, unless otherwise noted.
AD7870 SPECIFICATIONS
Table 1.
Parameter
DYNAMIC PERFORMANCE
2
Signal-to-Noise Ratio
3
(SNR)
@ +25°C
T
MIN
to T
MAX
Total Harmonic Distortion (THD)
Peak Harmonic or Spurious Noise
Intermodulation Distortion (IMD)
Second Order Terms
Third Order Terms
Track-and-Hold Acquisition Time
DC ACCURACY
Resolution
Minimum Resolution for which No Missing Codes
are Guaranteed
Integral Nonlinearity
Integral Nonlinearity
Differential Nonlinearity
Bipolar Zero Error
Positive Full-Scale Error
4
Negative Full-Scale Error
4
ANALOG INPUT
Input Voltage Range
Input Current
REFERENCE OUTPUT
REF OUT @ +25°C
REF OUT Tempco
Reference Load Sensitivity
(ΔREF OUT/ΔI)
LOGIC INPUTS
Input High Voltage, V
INH
Input Low Voltage, V
INL
Input Current, I
IN
Input Current (12/8/CLK Input Only)
Input Capacitance, C
IN 5
LOGIC OUTPUTS
Output High Voltage, V
OH
Output Low Voltage, V
OL
DB11 to DB0
Floating-State Leakage Current
Floating-State Output Capacitance
5
J, A
ADN7870
1
K, B
L, C
T
Units
Test Conditions/Comments
70
70
−80
−80
70
70
−80
−80
72
71
−80
−80
69
69
−78
−78
dB min
dB min
dB max
dB max
V
IN
= 10 kHz sine wave, f
SAMPLE
= 100 kHz
Typically 71.5 dB for 0 < V
IN
< 50 kHz
V
IN
= 10 kHz sine wave, f
SAMPLE
= 100 kHz
Typically −86 dB for 0 < V
IN
< 50 kHz
V
IN
= 10 kHz, f
SAMPLE
= 100 kHz
Typically −86 dB for 0 < V
IN
< 50 kHz
fa = 9 kHz, fb = 9.5 kHz, f
SAMPLE
= 50 kHz
fa = 9 kHz, fb = 9.5 kHz, f
SAMPLE
= 50 kHz
−80
−80
2
12
12
±1/2
−80
−80
2
12
12
±1/2
±1
±1
±5
±5
±5
±3
±500
2.99
3.01
±60
±1
−80
−80
2
12
12
±1/4
±1/2
±1
±5
±5
±5
±3
±500
2.99
3.01
±35
±1
−78
−78
2
12
12
±1/2
±1
±1
±5
±5
±5
±3
±500
2.99
3.01
±35
±1
dB max
dB max
μs max
Bits
Bits
LSB typ
LSB max
LSB max
LSB max
LSB max
LSB max
V
μA max
V min
V max
ppm/°C
max
mV max
±5
±5
±5
±3
±500
2.99
3.01
±60
±1
Reference load current change (0 μA to
500 μA). Reference load should not be
changed during conversion.
V
DD
= 5 V ± 5%
V
DD
= 5 V ± 5%
V
IN
= 0 V to V
DD
V
IN
= V
SS
to V
DD
2.4
0.8
±10
±10
10
4.0
0.4
±10
15
2.4
0.8
±10
±10
10
4.0
0.4
±10
15
2.4
0.8
±10
±10
10
4.0
0.4
±10
15
2.4
0.8
±10
±10
10
4.0
0.4
±10
15
V min
V max
μA max
μA max
pF max
V min
V max
μA max
pF max
I
SOURCE
= 40 μA
I
SINK
= 1.6 mA
Rev. C | Page 3 of
28
AD7870/AD7875/AD7876
Parameter
CONVERSION TIME
External Clock (f
CLK
= 2.5 MHz)
Internal Clock
6
POWER REQUIREMENTS
V
DD
V
SS
I
DD
I
SS
Power Dissipation
J, A
8
6.5/9
ADN7870
1
K, B
L, C
8
6.5/9
8
6.5/9
T
8
6.5/9
Units
μs max
μs min/
μs max
V nom
V nom
mA max
mA max
mW max
±5% for specified performance
±5% for specified performance
Typically 8 mA
Typically 4 mA
Typically 60 mW
Test Conditions/Comments
+5
−5
13
6
95
+5
−5
13
6
95
+5
−5
13
6
95
+5
−5
13
6
95
1
2
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.
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
DC ACCURACY
Resolution
Min Resolution for which No Missing
Codes Are Guaranteed
Integral Nonlinearity @ +25°C
T
MIN
to T
MAX
(AD7875 Only)
T
MIN
to T
MAX
(AD7876 Only)
Differential Nonlinearity
Unipolar Offset Error (AD7875 Only)
Bipolar Zero Error (AD7876 Only)
Full-Scale Error at +25°C
2
Full-Scale TC
2
Track-and-Hold Acquisition Time
DYNAMIC PERFORMANCE
3
(AD7875
ONLY)
Signal-to-Noise Ratio
4
(SNR)
@ +25°C
T
MIN
to T
MAX
Total Harmonic Distortion (THD)
Peak Harmonic or Spurious Noise
Intermodulation Distortion (IMD)
Second Order Terms
Third Order Terms
AD7875/AD7876
1
K, B
L, C
T
12
12
±1
±1
±1
±1
±5
±6
±8
±60
2
12
12
±1/2
±1
±1/2
±1
±5
±2
±8
±35
2
12
12
±1
±1
±1
±1.5/−1.0
±5
±6
±8
±60
2
Units
Bits
Bits
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
ppm/°C max
μs max
Test Conditions/Comments
Typical full-scale error is ±1 LSB
Typical TC is ±20 ppm/°C
70
70
−80
−80
72
71
−80
−80
69
69
−78
−78
dB min
dB min
dB max
dB max
V
IN
= 10 kHz sine wave, f
SAMPLE
= 100 kHz
Typically 71.5 dB for 0 < V
IN
< 50 kHz
V
IN
= 10 kHz sine wave, f
SAMPLE
= 100 kHz
Typically −86 dB for 0 < V
IN
< 50 kHz
V
IN
= 10 kHz, f
SAMPLE
= 100 kHz
Typically −86 dB for 0 < V
IN
< 50 kHz
fa = 9 kHz, fb = 9.5 kHz, f
SAMPLE
= 50 kHz
fa = 9 kHz, fb = 9.5 kHz, f
SAMPLE
= 50 kHz
−80
−80
−80
−80
−78
−78
dB max
dB max
Rev. C | Page 4 of
28
AD7870/AD7875/AD7876
Parameter
ANALOG INPUT
AD7875 Input Voltage Range
AD7875 Input Current
AD7876 Input Voltage Range
AD7876 Input Current
REFERENCE OUTPUT
REF OUT @ +25°C
REF OUT Tempco
Reference Load Sensitivity
(ΔREF OUT/ΔI)
LOGIC INPUTS
Input High Voltage, V
INH
Input Low Voltage, V
INL
Input Current, I
IN
Input Current (12/8/CLK Input Only)
Input Capacitance, C
IN 5
LOGIC OUTPUTS
Output High Voltage, V
OH
Output Low Voltage, V
OL
DB11–DB0
Floating-State Leakage Current
Floating-State Output
Capacitance
5
CONVERSION TIME
External Clock (f
CLK
= 2.5 MHz)
Internal Clock
POWER REQUIREMENTS
1
AD7875/AD7876
1
K, B
L, C
T
0 to +5
500
±10
±600
2.99
3.01
±60
−1
0 to +5
500
±10
±600
2.99
3.01
±35
−1
0 to +5
500
±10
±600
2.99
3.01
±60
−1
Units
V
μA max
V
μA max
V min
V max
ppm/°C max
mV max
Test Conditions/Comments
Typical tempco Is ±20 ppm/°C
Reference load current change (0 μA to 500 μA).
Reference load should not be changed during
conversion.
V
DD
= 5 V ± 5%
V
DD
= 5 V ± 5%
V
IN
= 0 V to V
DD
V
IN
= V
SS
to V
DD
2.4
0.8
±10
±10
10
4.0
0.4
10
15
2.4
0.8
±10
±10
10
4.0
0.4
10
15
2.4
0.8
±10
±10
10
4.0
0.4
10
15
V min
V max
μA max
μA max
pF max
V min
V max
μA max
pF max
I
SOURCE
= 40 mA
I
SINK
= 1.6 mA
8
6.5/9
8
6.5/9
8
6.5/9
μs max
μs min/μs
max
Refer to the power requirements in Table 1.
As per AD7870
For the AD7875, the temperature range for the K and L versions is from 0°C to +70°C; for the B and C versions is−40°C to +85°C; and for the T version is −55°C to
+125°C. For the AD7876, the temperature range for the B and C versions is from −40°C to +85°C and for the T version is−55°C to +125°C.
2
Includes internal reference error and is calculated after unipolar offset error (AD7875) or bipolar zero error (AD7876) has been adjusted out. Full-scale error refers to
both positive and negative full-scale error for the AD7876.
3
Dynamic performance parameters are not tested on the AD7876, but these are typically the same as for the AD7875.
4
SNR calculation includes distortion and noise components.
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