AD7818ARMZ-REEL Просмотр технического описания (PDF) - Analog Devices

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AD7818ARMZ-REEL

Dual, Low Power CMOS, Analog Front End with DSP Microcomputer

Analog Devices 

AD7817/AD7818

Data Sheet

Parameter

POWER REQUIREMENTS (AD7817 ONLY)

VDD

IDD

Normal Operation

Using External Reference

Power-Down (VDD = 5 V)

Power-Down (VDD = 3 V)

Auto Power-Down Mode

10 SPS Throughput Rate

1 kSPS Throughput Rate

10 kSPS Throughput Rate

Power-Down

DYNAMIC PERFORMANCE (AD7818 ONLY)6

A Version1

5.5

2.7

2

1.75

10

4

6.4

48.8

434

12

Signal-to-(Noise + Distortion) Ratio2

57

Total Harmonic Distortion2

–65

Peak Harmonic or Spurious Noise2

–67

Intermodulation Distortion2

Second-Order Terms

–67

Third-Order Terms

–67

Channel-to-Channel Isolation2

–80

DC ACCURACY (AD7818 ONLY)6

Resolution

10

Minimum Resolution for Which No

10

Missing Codes are Guaranteed

Relative Accuracy2

±1

Differential Nonlinearity2

±1

Gain Error2

±10

Offset Error2

±4

TEMPERATURE SENSOR (AD7818 ONLY)6

Measurement Error

Ambient Temperature 25°C

±2

TMIN to TMAX

±3

Measurement Error

Ambient Temperature 25°C

±2

TMIN to TMAX

±3

Temperature Resolution

1/4

ON-CHIP REFERENCE (AD7818 ONLY)5

Temperature Coefficient3

30

CONVERSION RATE (AD7818 ONLY)6

Track-and-Hold Acquisition Time4

400

Conversion Time

Temperature Sensor

27

Channel 1

9

B Version1

5.5

2.7

2

1.75

10

4

6.4

48.8

434

12

S Version1

5.5

2.7

2

1.75

12.5

4.5

6.4

48.8

434

13.5

Unit

Test Conditions/Comments

V max

V min

mA max

mA max

µA max

µA max

µW typ

µW typ

µW typ

µW max

dB min

dB max

dB typ

dB typ

dB typ

dB typ

Bits

Bits

LSB max

LSB max

LSB max

LSB max

For specified performance

Logic inputs = 0 V or VDD

1.6 mA typical

2.5 V external reference connected

5.5 µA typical

2 µA typical

VDD = 3 V

See the Power vs. Throughput

section for description of power

dissipation in auto power-down mode

Typically 6 µW

Sample rate = 100 kSPS, any channel,

fIN = 20 kHz

−75 dB typical

−75 dB typical

fa = 19.9 kHz, fb = 20.1 kHz

fIN = 20 kHz

Any channel

°C max

°C max

°C max

°C max

°C/LSB

ppm/°C typ

External reference VREF = 2.5 V

On-chip reference

Nominal 2.5 V

ns max

Source impedance < 10 Ω

µs max

µs max

Rev. D | Page 4 of 20

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