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AD7939BCP

8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer

Analog Devices 

AD7938/AD7939

Parameter

REFERENCE INPUT/OUTPUT

VREF Input Voltage5

DC Leakage Current

VREF Input Impedance

VREFOUT Output Voltage

VREFOUT Temperature Coefficient

VREF Noise

VREF Output Impedance

VREF Input Capacitance

LOGIC INPUTS

Input High Voltage, VINH

Input Low Voltage, VINL

Input Current, IIN

Input Capacitance, CIN4

LOGIC OUTPUTS

Output High Voltage, VOH

Output Low Voltage, VOL

Floating-State Leakage Current

Floating-State Output Capacitance4

Output Coding

CONVERSION RATE

Conversion Time

Track-and-Hold Acquisition Time

Throughput Rate

POWER REQUIREMENTS

VDD

VDRIVE

IDD6

Normal Mode (Static)

Normal Mode (Operational)

Autostandby Mode

Full/Autoshutdown Mode (Static)

Power Dissipation

Normal Mode (Operational)

Autostandby Mode (Static)

Full/Autoshutdown Mode (Static)

B Version1

Unit

Test Conditions/Comments

2.5

V

±1% for specified performance

±1

µA max

10

kΩ typ

2.5

V

±0.2% max @ 25°C

25

ppm/°C max 5 ppm/°C typ

10

µV typ

0.1 Hz to 10 Hz bandwidth

130

µV typ

0.1 Hz to 1 MHz bandwidth

10

Ω typ

15

pF typ

When in track

25

pF typ

When in hold

2.4

V min

0.8

V max

±5

µA max

Typically 10 nA, VIN = 0 V or VDRIVE

10

pF max

2.4

V min

0.4

V max

±3

µA max

10

pF max

Straight (Natural) Binary

Twos Complement

ISOURCE = 200 µA

ISINK = 200 µA

CODING bit = 0

CODING bit = 1

t2 + 13 tCLK

125

1.5

ns

ns max

MSPS max

Full-scale step input

2.7/5.25

2.7/5.25

0.8

2.7

2.0

0.3

160

2

V min/max

V min/max

mA typ

mA max

mA max

mA typ

µA typ

µA max

Digital I/PS = 0 V or VDRIVE

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

VDD = 4.75 V to 5.25 V

VDD = 2.7 V to 3.6 V

FSAMPLE = 100 kSPS, VDD = 5 V

(Static)

SCLK on or off

13.5

6

800

480

10/6

mW max

mW max

µW typ

µW typ

µW max

VDD = 5 V

VDD = 3 V

VDD = 5 V

VDD = 3 V

VDD = 5 V/3 V

1 Temperature ranges as follows: B Versions: −40°C to +85°C.

2 See the Terminology section.

3 For full common-mode range, see Figure 25 and Figure 26.

4 Sample tested during initial release to ensure compliance.

5 This device is operational with an external reference in the range 0.1 V to VDD. See the Reference Section for more information.

6 Measured with a midscale dc analog input.

Rev. 0 | Page 4 of 32

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