Datasheet

AD7357
Rev. B | Page 4 of 20
AD7357B/AD7357Y AD7357WY
Parameter
Min Typ Max Min Typ Max
Unit
Test Conditions/
Comments
REFERENCE INPUT/OUTPUT
V
REF
Input Voltage Range 2.048 + 0.1 V
DD
2.048 + 0.1 V
DD
V
V
REF
Input Current 0.3 0.45 0.3 0.45 mA When in reference
overdrive mode
V
REF
Output Voltage 2.038 2.058 2.038 2.058 V ±2.048 V ± 0.5% max @
V
DD
= 2.5 V ± 5%
2.043 2.053 2.043 2.053 V 2.048 V ± 0.25% max @
V
DD
= 2.5 V ± 5% and 25°C
V
REF
Temperature Coefficient 6 20 6 20 ppm/°C
V
REF
Long Term Stability 100 100 ppm For 1000 hours
V
REF
Thermal Hysteresis 50 50 ppm
V
REF
Noise 60 60 μV rms
V
REF
Output Impedance 1 1 Ω
LOGIC INPUTS
Input High Voltage, V
INH
0.6 × V
DRIVE
0.6 × V
DRIVE
V
Input Low Voltage, V
INL
0.3 × V
DRIVE
0.3 × V
DRIVE
V
Input Current, I
IN
±1 ±1 μA V
IN
= 0 V or V
DRIVE
Input Capacitance, C
IN
3 3 pF
LOGIC OUTPUTS
Output High Voltage, V
OH
V
DRIVE
− 0.2 V
DRIVE
− 0.2 V
Output Low Voltage, V
OL
0.2 0.2 V
Floating-State Leakage Current ±1 ±1 μA
Floating-State Output Capacitance 5.5 5.5 pF
Output Coding Straight binary Straight binary
CONVERSION RATE
Conversion Time t
2
+ 15.5
× t
SCLK
t
2
+ 15.5
× t
SCLK
ns
Track-and-Hold Acquisition Time
2
33 33 ns Full-scale step input
Throughput Rate 4.2 4.2 MSPS
POWER REQUIREMENTS
V
DD
2.25 2.75 2.25 2.75 V Nominal V
DD
= 2.5 V
V
DRIVE
3
2.25 3.6 2.25 3.6 V
I
TOTAL
4
Digital inputs = 0 V or V
DRIVE
Normal Mode (Operational) 14 20 14 20 mA
Normal Mode (Static) 6 7.6 6 7.6 mA SCLK on or off
Partial Power-Down Mode 3.5 4.5 3.5 4.5 mA SCLK on or off
Full Power-Down Mode 5 40 5 40 μA SCLK on or off
Power Dissipation
Normal Mode (Operational) 36 59 36 59 mW
Normal Mode (Static) 16 21 16 21 mW SCLK on or off
Partial Power-Down Mode 9.5 11.5 9.5 11.5 mW SCLK on or off
Full Power-Down Mode 16 110 16 110 μW SCLK on or off
1
Temperature ranges are as follows: AD7357Y: −40°C to +125°C, AD7357B: −40°C to +85°C, AD7357WY: −40°C to +125°C.
2
See the Terminology section.
3
The interface is functional with V
DRIVE
voltages down to 1.8 V. In this condition, the SCLK speed may need to be slowed down. See the access and hold times in the
Timing Specifications section.
4
I
TOTAL
is the total current flowing in V
DD
and V
DRIVE
.