AD7895 datasheet(2/12 Pages) AD

2 / 12 page

–2–

REV. 0

AD7895–SPECIFICATIONS

Parameter

A Versionsl

B Versions

Units

Test Conditions/Comments

DYNAMIC PERFORMANCE

Signal to (Noise + Distortion) Ratio

@ +25

°C

dB min

fIN = 50 kHz Sine Wave, fSAMPLE = 200 kHz

TMIN to TMAX

dB min

Total Harmonic Distortion (THD)

–78

dB max

fIN = 50 kHz Sine Wave, fSAMPLE = 200 kHz,

Typically –87 dB

Peak Harmonic or Spurious Noise

–89

dB typ

fIN = 50 kHz Sine Wave, fSAMPLE = 200 kHz

Intermodulation Distortion (IMD)

fa = 9 kHz, fb = 9.5 kHz, fSAMPLE = 200 kHz

2nd Order Terms

–87

dB typ

3rd Order Terms

–87

dB typ

DC ACCURACY

Resolution

Bits

Minimum Resolution for which

No Missing Codes are Guaranteed

Bits

Relative Accuracy

±1

LSB max

Typically 0.4 LSB

Differential Nonlinearity

±1

LSB max

Positive Full-Scale Error

±3

±2

LSB max

AD7895-2

Unipolar Offset Error

±3

±2

LSB max

AD7895-10, AD7895-3 Only

Negative Full-Scale Error

±3

±2

LSB max

Bipolar Zero Error

±4

±3

LSB max

ANALOG INPUT

AD7895-10

Input Voltage Range

±10

Volts

Input Resistance

Ω min

AD7895-3

Input Voltage Range

±2.5

Volts

Input Resistance

Ω min

AD7895-2

Input Voltage Range

0 to +2.5

Volts

Input Current

500

nA max

REFERENCE INPUT

REF IN Input Voltage Range

2.375/2.625

V min/V max

2.5 V

± 5%

Input Current

µA max

Input Capacitance

pF max

LOGIC INPUTS

Input High Voltage, VINH

2.4

V min

VDD = 5 V ± 5%

Input Low Voltage, VINL

0.8

V max

VDD = 5 V ± 5%

Input Current, IIN

±10

µA max

VIN = 0 V to VDD

Input Capacitance, CIN

pF ax

LOGIC OUTPUTS

Output High Voltage, VOH

4.0

V min

ISOURCE = 200 µA

Output Low Voltage, VOL

0.4

V max

ISINK = 1.6 mA

Output Coding

AD7895-10, AD7895-3

2s Complement

AD7895-2

Straight (Natural) Binary

CONVERSION RATE

Conversion Time

Mode 1 Operation

3.8

µs max

Mode 2 Operation

9.8

µs max

Track/Hold Acquisition Time3

0.5

µs max

POWER REQUIREMENTS

VDD

V nom

±5% for Specified Performance

IDD

mA max

Digital Inputs @ VDD, VDD = 5 V ± 5%

Power Dissipation

mW max

Typically 16 mW

Power-Down Mode

IDD @ +25°C5

µA max

Digital Inputs @ GND, VDD = 5 V ± 5%

TMIN to TMAX

µA max

Digital Inputs @ GND, VDD = 5 V ± 5%

Power Dissipation @ +25

°C25

µW max

NOTES

1Temperature ranges are as follows: A, B Versions: –40

°C to +85°C.

2Applies to Mode 1 operation. See section on “Operating Modes.”

3See Terminology.

4Sample tested @ +25

°C to ensure compliance.

5This 9.8

µs includes the “wake-up” time from standby. This “wake-up” time is timed from the rising edge of CONVST, whereas conversion is timed from the falling edge of CONVST, for

narrow CONVST pulse width the conversion time is effectively the “wake-up” time plus conversion time hence 9.8

µs. This can be seen from Figure 3. Note that if the CONVST pulse width

is greater than 6

µs then the effective conversion time will increase beyond 9.8 µs.

Specifications subject to change without notice.

(VDD = +5 V, GND = 0 V, REF IN = +2.5 V.

All specifications TMIN to TMAX unless otherwise noted)

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