AD7868BN datasheet(2/16 Pages) AD

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ABT

Parameter

Version

Units

Test Conditions/Comments

DYNAMIC PERFORMANCE

Signal-to-Noise Ratio

3, 4 (SNR) @ +25

°C

dB min

VIN = 10 kHz Sine Wave, fSAMPLE = 83 kHz

TMIN to TMAX

dB min

Typically 71.5 dB for 0 < VIN < 41.5 kHz

Total Harmonic Distortion (THD)

–78

–76

dB max

VIN = 10 kHz Sine Wave, fSAMPLE = 83 kHz

Typically 71.5 dB for 0 < VIN < 41.5 kHz

Peak Harmonic or Spurious Noise

–78

–76

dB max

VIN = 10 kHz Sine Wave, fSAMPLE = 83 kHz

Typically 71.5 dB for 0 < VIN < 41.5 kHz

Intermodulation Distortion (IMD)

Second Order Terms

–78

–76

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

Track/Hold Acquisition Time

µs max

DC ACCURACY

Resolution

Bits

Minimum Resolution

Bits

No Missing Codes Are Guaranteed

Integral Nonlinearity

±12

LSB typ

Integral Nonlinearity

±1

LSB max

Differential Nonlinearity

±0.9

LSB max

Bipolar Zero Error

±5

LSB max

Positive Gain Error5

±5

LSB max

Negative Gain Error5

±5

LSB max

ANALOG INPUT

Input Voltage Range

±3

Volts

Input Current

±1

mA max

REFERENCE OUTPUT

RO ADC @ +25

°C

2.99/3.01

V min/V max

RO ADC TC

±25

ppm/

°C typ

RO ADC TC

±40

±50

ppm/

°C max

Reference Load Sensitivity (

∆RO ADC vs. ∆I)

–1.5

mV max

Reference Load Current Change (0

µA–500 µA),

Reference Load Should Not Be Changed

During Conversion

LOGIC INPUTS (CONVST, CLK, CONTROL)

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

7 (CONTROL Input Only)

±10

µA max

VIN = VSS to DGND

Input Capacitance, CIN

pF max

LOGIC OUTPUTS

DR, RFS Outputs

Output Low Voltage, VOL

0.4

V max

ISINK = 1.6 mA, Pull-Up Resistor = 4.7 kΩ

RCLK Output

Output Low Voltage, VOL

0.4

V max

ISINK = 2.6 mA, Pull-Up Resistor = 2 kΩ

DR, RFS, RCLK Outputs

Floating-State Leakage Current

±10

µA max

Floating-State Output Capacitance

pF max

CONVERSION TIME

External Clock

µs max

Internal Clock

µs max

The Internal Clock Has a Nominal Value of 2.0 MHz

POWER REQUIREMENTS

For Both DAC and ADC

VDD

V nom

±5% for Specified Performance

VSS

–5

V nom

±5% for Specified Performance

IDD

mA max

Cumulative Current from the Two VDD Pins

ISS

mA max

Cumulative Current from the Two VSS Pins

Total Power Dissipation

170

190

mW max

Typically 130 mW

NOTES

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

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

IN =

± 3 V

3SNR calculation includes distortion and noise components.

4SNR degradation due to asynchronous DAC updating during conversion is 0.1 dB typ.

5Measured with respect to internal reference.

6For capacitive loads greater than 50 pF a series resistor is required (see INTERNAL REFERENCE section).

7Tying the CONTROL input to V

DD places the device in a factory test mode where normal operation is not exhibited.

8Sample tested @ +25

°C to ensure compliance.

Specifications subject to change without notice.

REV. B

–2–

AD7868–SPECIFICATIONS

(VDD = +5 V

5%, VSS = –5 V

5%, AGND = DGND = 0 V, fCLK = 2.0 MHz external. All specifications TMIN to TMAX-

unless otherwise noted.)

ADC SECTION

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