AD7849 datasheet(2/15 Pages) AD

2 / 15 page

AB, T

Parameter

Versions

Units

Test Conditions/Comments

RESOLUTION

Bits

A Versions: 1 LSB = 2 (VREF+–VREF–)/2

B, C, T Versions: 1 LSB = 2 (VREF+–VREF–)/2

UNIPOLAR OUTPUT

VREF– = 0 V, VOUT = 0 V to +10 V

Relative Accuracy @ +25

°C

±4

±6

±4

LSBs typ

TMIN to TMAX

±5

±16

±8

LSBs max

Differential Nonlinearity

±0.25

±0.9

±0.5

LSBs max

All Grades Guaranteed Monotonic Over Temperature

Gain Error @ +25

°C

±1

±4

LSBs typ

VOUT Load = 10 M

Ω

TMIN to TMAX

±4

±16

LSBs max

Offset Error @ +25

°C

±1

±4

LSBs typ

TMIN to TMAX

±6

±24

±16

LSBs max

Gain TC

±2

ppm FSR/

°C typ

Offset TC

±2

ppm FSR/

°C typ

BIPOLAR OUTPUT

VREF– = –5 V, VOUT = –10 V to +10 V

Relative Accuracy @ +25

°C

±2

±3

±2

LSBs typ

TMIN to TMAX

±3

±8

±4

LSBs max

Differential Nonlinearity

±0.25

±0.9

±0.5

LSBs max

All Grades Guaranteed Monotonic Over Temperature

Gain Error @ +25

°C

±1

±4

LSBs typ

VOUT Load = 10 M

Ω

TMIN to TMAX

±4

±16

LSBs max

Offset Error @ +25

°C

±0.5

±2

LSBs typ

TMIN to TMAX

±3

±12

±8

LSBs max

Bipolar Zero Error @ +25

°C

±0.5

±2

LSBs typ

TMIN to TMAX

±4

±12

±8

LSBs max

Gain TC

±2

ppm FSR/

°Ctyp

Offset TC

±2

ppm FSR/

°Ctyp

Bipolar Zero TC

±2

ppm FSR/

°Ctyp

REFERENCE INPUT

Input Resistance

Ω min

Resistance from VREF+ to VREF–

Ω max

Typically 34 k

Ω

VREF+ Range

VSS + 6 to

Volts

VDD – 6

VREF– Range

VSS + 6 to

Volts

VDD – 6

OUTPUT CHARACTERISTICS

Output Voltage Swing

VSS + 4 to

V max

VDD – 4

Resistive Load

Ω min

To 0 V

Capacitive Load

200

pF max

To 0 V

Output Resistance

0.3

Ω typ

Short Circuit Current

±25

mA typ

Voltage Range: –10 V to +10 V

DIGITAL INPUTS

VINH, Input High Voltage

2.4

V min

VINL, Input Low Voltage

0.8

V max

IINH, Input Current

±10

µA max

CIN, Input Capacitance

pF max

DIGITAL OUTPUTS

VOL (Output Low Voltage)

0.4

Volts max

ISINK = 1.6 mA

VOH (Output High Voltage)

4.0

Volts min

ISOURCE = 400

µA

Floating State Leakage Current

±10

µA max

Floating State Output

Capacitance

pF max

POWER REQUIREMENTS

VDD

+14.25/+15.75 +14.25/+15.75 +14.25/+15.75

V min/V max

VSS

–14.25/–15.75

V min/V max

VCC

+4.75/+5.25

V min/V max

IDD

mA max

VOUT Unloaded, VINH = VDD – 0.1 V, VINL = 0.1 V

ISS

mA max

VOUT Unloaded, VINH = VDD – 0.1 V, VINL = 0.1 V

ICC

2.5

mA max

VINH = VDD – 0.1 V, VINL = 0.1 V

Power Supply Sensitivity

0.4

1.5

LSB/V max

Power Dissipation

100

mW typ

VOUT Unloaded

NOTES

1Temperature ranges: A, B, C Versions: –40

°C to +85°C; T Version: –55°C to +125°C.

2Minimum load for T Version is 3 k

Ω.

3Guaranteed by design and characterization, not production tested.

4The AD7849 is functional with power supplies of

±12 V. See Typical Performance Curves.

5Sensitivity of Gain Error, Offset Error and Bipolar Zero Error to V

DD, VSS variations.

Specifications subject to change without notice.

AD7849–SPECIFICATIONS1

REV. B

–2–

(VDD = +14.25 V to +15.75 V; VSS = –14.25 V to –15.75 V; VCC = +4.75 V to +5.25 V; VOUT loaded with 2 k

Ω,2 200 pF to 0 V; VREF+ = +5 V;

ROFS connected to 0 V; TA = TMIN to TMAX, unless otherwise noted)

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