AD7938BCPZ datasheet(6/36 Pages) AD

6 / 36 page

AD7938/AD7939

Data Sheet

Rev. C | Page 6 of 36

Parameter

Value1

Unit

Test Conditions/Comments

REFERENCE INPUT/OUTPUT

VREF Input Voltage5

2.5

±1% for specified performance

DC Leakage Current4

±1

µA max

External reference applied to pin

VREFOUT Output Voltage

2.5

±0.2% max @ 25°C

VREFOUT Temperature Coefficient

ppm/°C max

ppm/°C typ

VREF Noise

µV typ

0.1 Hz to 10 Hz bandwidth

130

µV typ

0.1 Hz to 1 MHz bandwidth

VREF Output Impedance

Ω typ

VREF Input Capacitance

pF typ

When in track

pF typ

When in hold

LOGIC INPUTS

Input High Voltage, VINH

2.4

V min

Input Low Voltage, VINL

0.8

V max

Input Current, IIN

±5

µA max

Typically 10 nA, VIN = 0 V or VDRIVE

Input Capacitance, CIN4

pF typ

LOGIC OUTPUTS

Output High Voltage, VOH

2.4

V min

ISOURCE = 200 µA

Output Low Voltage, VOL

0.4

V max

ISINK = 200 µA

Floating-State Leakage Current

±3

µA max

Floating-State Output Capacitance4

pF typ

Output Coding

Straight (natural) binary

CODING bit = 0

Twos complement

CODING bit =1

CONVERSION RATE

Conversion Time

t2 + 13 tCLKIN

Track-and-Hold Acquisition Time

125

ns max

Full-scale step input

ns typ

Sine wave input

Throughput Rate

1.5

MSPS max

POWER REQUIREMENTS

VDD

2.7/5.25

V min/max

VDRIVE

2.7/5.25

V min/max

IDD6

Digital inputs = 0 V or VDRIVE

Normal Mode (Static)

0.8

mA typ

VDD = 2.7 V to 5.25 V, SCLK on or off

Normal Mode (Operational)

2.7

mA max

VDD = 4.75 V to 5.25 V

2.0

mA max

VDD = 2.7 V to 3.6 V

Autostandby Mode

0.3

mA typ

fSAMPLE = 100 kSPS, VDD = 5 V

160

µA typ

Static

Full/Autoshutdown Mode (Static)

µA max

SCLK on or off

Power Dissipation

Normal Mode (Operational)

13.5

mW max

VDD = 5 V

mW max

VDD = 3 V

Autostandby Mode (Static)

800

µW typ

VDD = 5 V

480

µW typ

VDD = 3 V

Full/Autoshutdown Mode (Static)

µW max

VDD = 5 V

µW max

VDD = 3 V

Temperature range is −40°C to +85°C.

See the Terminology section.

For full common-mode range, see Figure 26 and Figure 27.

Sample tested during initial release to ensure compliance.

This device is operational with an external reference in the range of 0.1 V to VDD. See the Reference section for more details.

Measured with a midscale dc analog input.

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