Datasheet

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 C
REF
= 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
V
IL
−0.3 +0.6 V
V
IH
2.1 OVDD + 0.3 V
I
IL
−1 +1 µA
I
IH
−1 +1 µA
DIGITAL OUTPUTS
Data Format Parallel or serial 18-bit
Pipeline Delay
5
V
OL
I
SINK
= 500 µA 0.4 V
V
OH
I
SOURCE
= –500 µA OVDD − 0.6 V
POWER SUPPLIES
Specified Performance
AVDD 4.75
6
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
Operating Current
7, 8
@ 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
In Power-Down Mode
9
PD = high 10 µW
TEMPERATURE RANGE
10
Specified Performance T
MIN
to T
MAX
−40 +85 °C
1
With V
IN
= unipolar 5 V or unipolar 10 V ranges, the input current is typically 70 A. 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 V
REF
– 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.