AD7818AR 查看數據表（PDF） - Analog Devices

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AD7818AR

Single- and 4-Channel, 9 μ
s, 10-Bit ADCs with On-Chip Temperature Sensor

Analog Devices 

AD7816/AD7817/AD7818

AD7817–SPECIFICATIONS1

(VDD = 2.7 V to 5.5 V, GND = 0 V, REFIN = 2.5 V unless otherwise noted)

Parameter

A Version *B Version *S Version Unit

Test Conditions/Comments

DYNAMIC PERFORMANCE

Signal to (Noise + Distortion) Ratio2 58

Total Harmonic Distortion2

–65

Peak Harmonic or Spurious Noise2 –65

Intermodulation Distortion2

Second Order Terms

–67

Third Order Terms

–67

Channel-to-Channel Isolation2

–80

DC ACCURACY

Resolution

Minimum Resolution for Which

No Missing Codes are Guaranteed

Relative Accuracy2

Differential Nonlinearity2

Gain Error2

Gain Error Match2

Offset Error2

Offset Error Match

10

10

Ϯ1

Ϯ1

Ϯ2

Ϯ10

Ϯ1/2

Ϯ2

Ϯ1/2

58

–65

–65

–67

–67

–80

10

10

Ϯ1

Ϯ1

Ϯ2

Ϯ10

Ϯ1/2

Ϯ2

Ϯ1/2

58

–65

–65

–67

–67

–80

10

10

Ϯ1

Ϯ1

Ϯ2

+20/–10

Ϯ1/2

Ϯ2

Ϯ1/2

dB min

dB max

dB max

dB typ

dB typ

dB typ

Bits

Sample Rate = 100 kSPS, Any

Channel, fIN = 20 kHz

–75 dB typ

–75 dB typ

fa =19.9 kHz, fb = 20.1 kHz

fIN = 20 kHz

Any Channel

Bits

LSB max

LSB max

LSB max

LSB max

LSB max

LSB max

LSB max

External Reference

Internal Reference

TEMPERATURE SENSOR1

Measurement Error

Ambient Temperature 25°C

TMIN to TMAX

Measurement Error

Ambient Temperature 25°C

TMIN to TMAX

Temperature Resolution

Ϯ2

Ϯ3

Ϯ2.25

Ϯ3

1/4

Ϯ1

Ϯ2

Ϯ2.25

Ϯ3

1/4

Ϯ2

Ϯ3

Ϯ2.25

Ϯ6

1/4

°C max

°C max

°C max

°C max

°C/LSB

External Reference VREF = 2.5 V

On-Chip Reference

REFERENCE INPUT3, 4

REFIN Input Voltage Range3

Input Impedance

Input Capacitance

2.625

2.375

40

10

2.625

2.375

40

10

2.625

2.375

40

10

V max

V min

kΩ min

pF max

2.5 V + 5%

2.5 V – 5%

ON-CHIP REFERENCE5

Temperature Coefficient3

80

80

Nominal 2.5 V

150

ppm/°C typ

CONVERSION RATE

Track/Hold Acquisition Time4

400

400

Conversion Time

Temperature Sensor

27

27

Channels 1 to 4

9

9

400

ns max Source Impedance < 10 Ω

27

µs max

9

µs max

POWER REQUIREMENTS

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

5.5

5.5

2.7

2.7

2

2

1.75

1.75

10

10

4

4

6.4

6.4

48.8

48.8

434

434

12

12

5.5

V max

For Specified Performance

2.7

V min

Logic Inputs = 0 V or VDD

2

mA max 1.6 mA typ

1.75

mA max 2.5 V External Reference Connected

12.5

µA max 5.5 µA typ

4.5

µA max 2 µA typ

VDD = 3 V

6.4

µW typ See Power vs. Throughput Section for

48.8

µW typ Description of Power Dissipation in

434

µW typ Auto Power-Down Mode

13.5

µW max Typically 6 µW

–2–

REV. C

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