EVAL-AD7816/AD7817/AD7818EB Просмотр технического описания (PDF) - Analog Devices

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EVAL-AD7816/AD7817/AD7818EB

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

Analog Devices 

AD7816/AD7817/AD7818

AD7816/AD7818 –SPECIFICATIONS 6

1 (VDD = 2.7 V to 5.5 V, GND = 0 V, REFIN = 2.5 V unless

otherwise noted)

Parameter

A Version Unit

Test Conditions/Comments

DYNAMIC PERFORMANCE (AD7818 Only)

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)

Resolution

10

Minimum Resolution for Which

No Missing Codes are Guaranteed

10

Relative Accuracy2

Ϯ1

Differential Nonlinearity2

Ϯ1

Gain Error2

Ϯ10

Offset Error2

Ϯ4

dB min

dB max

dB typ

dB typ

dB typ

dB typ

Bits

Bits

LSB max

LSB max

LSB max

LSB max

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

TEMPERATURE SENSOR1

Measurement Error

Ambient Temperature 25°C

TMIN to TMAX

Measurement Error

Ambient Temperature 25°C

TMIN to TMAX

Temperature Resolution

External Reference VREF = 2.5 V

Ϯ2

°C max

Ϯ3

°C max

On-Chip Reference

Ϯ2

°C max

Ϯ3

°C max

1/4

°C/LSB

REFERENCE INPUT3, 4 (AD7816 Only)

REFIN Input Voltage Range3

Input Impedance

Input Capacitance

2.625

2.375

50

10

V max

V min

kΩ min

pF max

2.5 V + 5%

2.5 V – 5%

ON-CHIP REFERENCE5

Temperature Coefficient3

Nominal 2.5 V

30

ppm/°C typ

CONVERSION RATE

Track/Hold Acquisition Time4

Conversion Time

Temperature Sensor

Channel 1

400

ns max

Source Impedance < 10 Ω

27

µs max

9

µs max

(AD7818 Only)

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

2.7

2

1.75

10.75

4.5

6.4

48.8

434

13.5

V max

V min

mA max

mA max

µA max

µA max

µW typ

µW typ

µW typ

µW max

For Specified Performance

Logic Inputs = 0 V or VDD

1.3 mA typ

2.5 V External Reference Connected

6 µA typ

2 µA typ

VDD = 3 V

See Power vs. Throughput Section for

Description of Power Dissipation in

Auto Power-Down Mode

Typically 6 µW

REV. C

–3–

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