AD7876BQ datasheet(3/20 Pages) AD

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AD7875/AD7876

Parameter

K, B

L, C

Units

Test Conditions/Comments

DC ACCURACY

Resolution

Bits

Minimum Resolution for Which

No Missing Codes Are Guaranteed

Bits

Integral Nonlinearity @ +25

°C

±1

±1/2

±1

LSB max

TMIN to TMAX (AD7875 Only)

±1

LSB max

TMIN to TMAX (AD7876 Only)

±1

±1/2

±1

LSB max

Differential Nonlinearity

±1

±1.5/–1.0 LSB max

Unipolar Offset Error (AD7875 Only)

±5

LSB max

Bipolar Zero Error (AD7876 Only)

±6

±2

±6

LSB max

Full-Scale Error at +25

°C2

±8

LSB max

Typical Full-Scale Error Is

±1 LSB

Full-Scale TC

±60

±35

±60

ppm/

°C max

Typical TC is

±20 ppm/°C

Track/Hold Acquisition Time

µs max

DYNAMIC PERFORMANCE

3 (AD7875 ONLY)

Signal-to-Noise Ratio

4 (SNR)

@ +25

°C

dB min

VIN = 10 kHz Sine Wave, fSAMPLE = 100 kHz

TMIN to TMAX

dB min

Typically 71.5 dB for 0 < VIN < 50 kHz

Total Harmonic Distortion (THD)

–80

–78

dB max

VIN = 10 kHz Sine Wave, fSAMPLE = 100 kHz

Typically –86 dB for 0 < VIN < 50 kHz

Peak Harmonic or Spurious Noise

–80

–78

dB max

VIN = 10 kHz, fSAMPLE = 100 kHz

Typically –86 dB for 0 < VIN < 50 kHz

Intermodulation Distortion (IMD)

Second Order Terms

–80

–78

dB max

fa = 9 kHz, fb = 9.5 kHz, fSAMPLE = 50 kHz

Third Order Terms

–80

–78

dB max

fa = 9 kHz, fb = 9.5 kHz, fSAMPLE = 50 kHz

ANALOG INPUT

AD7875 Input Voltage Range

0 to +5 0 to +5 0 to +5

Volts

AD7875 Input Current

500

µA max

AD7876 Input Voltage Range

±10

Volts

AD7876 Input Current

±600

µA max

REFERENCE OUTPUT

REF OUT @ +25

°C

2.99

V min

3.01

V max

REF OUT Tempco

±60

±35

±60

ppm/

°C max

Typical Tempco Is

±20 ppm/°C

Reference Load Sensitivity (

∆REF OUT/∆I)

–1

mV max

Reference Load Current Change (0

µA–500 µA)

Reference Load Should Not Be Changed

During Conversion.

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 Current (12/

8/CLK Input Only)

±10

µA max

VIN = VSS to VDD

Input Capacitance, CIN

pF max

LOGIC OUTPUTS

Output High Voltage, VOH

4.0

V min

ISOURCE = 40 µA

Output Low Voltage, VOL

0.4

V max

ISINK = 1.6 mA

DB11–DB0

Floating-State Leakage Current

µA max

Floating-State Output Capacitance5

pF max

CONVERSION TIME

External Clock (fCLK = 2.5 MHz)

µs max

Internal Clock

7/9

µs min/µs max

POWER REQUIREMENTS

As per AD7870

NOTES

1Temperature ranges are as follows: AD7875: K, L Versions, 0

°C to +70°C; B, C Versions, –40°C to +85°C; T Version, –55°C to +125°C. AD7876: B, C Versions,

–40

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

2Includes internal reference error and is calculated after unipolar offset error (AD7875) or bipolar zero error (AD7876) has been adjusted out.

Full-scale error refers to both positive and negative full-scale error for the AD7876.

3Dynamic performance parameters are not tested on the AD7876 but these are typically the same as for the AD7875.

4SNR calculation includes distortion and noise components.

5Sample tested @ +25

°C to ensure compliance.

Specifications subject to change without notice.

REV. B

AD7870/AD7875/AD7876

–3–

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