Datasheet

AD7643
Rev. 0 | Page 4 of 28
Parameter Conditions Min Typ Max Unit
Turn-On Settling Time C
REF
= 10 μF 5 ms
REFBUFIN Output Voltage REFBUFIN @ 25°C 1.19 V
REFBUFIN Output Resistance 6.33 kΩ
EXTERNAL REFERENCE PDREF = PDBUF = high
Voltage Range REF 1.8 2.5 AVDD + 0.1 V
Current Drain 1.25 MSPS throughput 100 μA
REFERENCE BUFFER PDREF = high, PDBUF = low
REFBUFIN Input Voltage Range REF = 2.048 V typical 1.05 1.2 1.30 V
REFBUFIN Input Current REFBUFIN = 1.2 V 1 nA
TEMPERATURE PIN
Voltage Output @ 25°C 278 mV
Temperature Sensitivity 1 mV/°C
Output Resistance 4.7 kΩ
DIGITAL INPUTS
Logic Levels
V
IL
−0.3 +0.6 V
V
IH
1.7 5.25 V
I
IL
−1 +1 μA
I
IH
−1 +1 μA
DIGITAL OUTPUTS
Data Format
7
Pipeline Delay
8
V
OL
I
SINK
= 500 μA 0.4 V
V
OH
I
SOURCE
= −500 μA OVDD − 0.3 V
POWER SUPPLIES
Specified Performance
AVDD 2.37 2.5 2.63 V
DVDD 2.37 2.5 2.63 V
OVDD 2.30
9
3.6 V
Operating Current
10
1.25 MSPS throughput
AVDD
11
With internal reference 24 mA
DVDD 1.5 mA
OVDD
12
0.5 mA
Power Dissipation
10, 11
With Internal Reference 1.25 MSPS throughput 65 80 mW
With External Reference 1.25 MSPS throughput 60 75 mW
In Power-Down Mode
12
PD = high 2 μW
TEMPERATURE RANGE
13
Specified Performance T
MIN
to T
MAX
−40 +85 °C
1
When using an external reference. With the internal reference, the input range is −0.1 V to V
REF
.
2
See Analog Inputs section.
3
Linearity is tested using endpoints, not best fit.
4
LSB means least significant bit. With the ±2.048 V input range, 1 LSB is 15.63 μV.
5
See Voltage Reference Input section. These specifications do not include the error contribution from the external reference.
6
All specifications in dB are referred to a full-scale input FS. Tested with an input signal at 0.5 dB below full-scale, unless otherwise specified.
7
Parallel or serial 18-bit.
8
Conversion results are available immediately after completed conversion.
9
See the Absolute Maximum Ratings section.
10
Tested in parallel reading mode.
11
With internal reference, PDREF and PDBUF are low; with external reference, PDREF and PDBUF are high.
12
With all digital inputs forced to OVDD.
13
Consult sales for extended temperature range.