
AD7634
Data Sheet
Rev. B | Page 4 of 32
Parameter
Conditions/Comments
Min
Typ
Max
Unit
INTERNAL REFERENCE
PDREF = PDBUF = low
Output Voltage
REF @ 25°C
4.965
5.000
5.035
V
Temperature Drift
40°C to +85°C
±3
ppm/°C
Line Regulation
AVDD = 5 V ± 5%
±15
ppm/V
Long-Term Drift
1000 hours
50
ppm
Turn-On Settling Time
CREF = 22 μF
10
ms
REFERENCE BUFFER
PDREF = high
REFBUFIN Input Voltage Range
2.4
2.5
2.6
V
EXTERNAL REFERENCE
PDREF = PDBUF = high
Voltage Range
REF
4.75
5
AVDD + 0.1
V
Current Drain
670 kSPS throughput
250
μA
TEMPERATURE PIN
Voltage Output
@ 25°C
311
mV
Temperature Sensitivity
1
mV/°C
Output Resistance
4.33
kΩ
DIGITAL INPUTS
Logic Levels
VIL
0.3
+0.6
V
VIH
2.1
OVDD + 0.3
V
IIL
1
+1
μA
IIH
1
+1
μA
DIGITAL OUTPUTS
Data Format
Parallel or serial 18-bit
VOL
ISINK = 500 μA
0.4
V
VOH
ISOURCE = –500 μA
OVDD 0.6
V
POWER SUPPLIES
Specified Performance
AVDD
5
5.25
V
DVDD
4.75
5
5.25
V
OVDD
2.7
5.25
V
VCC
7
15
15.75
V
VEE
15.75
15
0
V
@ 670 kSPS throughput
AVDD
With Internal Reference
18.2
mA
With Internal Reference Disabled
16.5
mA
DVDD
7.1
mA
OVDD
0.3
mA
VCC
VCC = 15 V, with internal reference buffer
2.9
mA
VCC = 15 V
2
mA
VEE
VEE = 15 V
2
mA
Power Dissipation
@ 670 kSPS throughput
With Internal Reference
PDREF = PDBUF = low
195
225
mW
With Internal Reference Disabled
PDREF = PDBUF = high
175
205
mW
PD = high
10
μW
Specified Performance
TMIN to TMAX
40
+85
°C
1 With VIN = unipolar 5 V or unipolar 10 V ranges, the input current is typically 70 μA. In all input ranges, the input current scales with throughput. See the Analog Inputs section. 2 Linearity is tested using endpoints, not best fit. All linearity is tested with an external 5 V reference.
3 LSB means least significant bit. All specifications in LSB do not include the error contributed by the reference.
4 All specifications in decibels are referred to a full-scale range input, FSR. Tested with an input signal at 0.5 dB below full-scale, unless otherwise specified.
5 Conversion results are available immediately after completed conversion.
6 4.75 V or VREF – 0.1 V, whichever is larger.
7 Tested in parallel reading mode.
8 With internal reference, PDREF = PDBUF = low; with internal reference disabled, PDREF = PDBUF = high. With internal reference buffer, PDBUF = low.
9 With all digital inputs forced to OVDD.
10 Consult sales for extended temperature range.