AD7751_15 datasheet(2/14 Pages) AD

No de pièce	AD7751

Description	Energy Metering IC with On-Chip Fault Detection

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Fabricant	AD [Analog Devices]

Site Internet	http://www.analog.com

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REV. 0

–2–

AD7751–SPECIFICATIONS1

(AVDD = DVDD = 5 V

5%, AGND = DGND = 0 V, On-Chip Reference, CLKIN = 3.58 MHz,

TMIN to TMAX = – 40 C to +85 C)

Parameter

A Version

B Version

Unit

Test Conditions/Comments

ACCURACY

1

Measurement Error

1 on Channel 1

Channel 2 with Full-Scale Signal (

±660 mV), 25°C

Gain = 1

0.1

% Reading typ

Over a Dynamic Range 500 to 1

Gain = 2

0.1

% Reading typ

Over a Dynamic Range 500 to 1

Gain = 8

0.1

% Reading typ

Over a Dynamic Range 500 to 1

Gain = 16

0.1

% Reading typ

Over a Dynamic Range 500 to 1

Phase Error

1 Between Channels

Line Frequency = 45 Hz to 65 Hz

V1 Phase Lead 37

°

(PF = 0.8 Capacitive)

±0.1

Degrees(

°) max AC/DC = 0 and AC/DC = 1

V1 Phase Lag 60

°

(PF = 0.5 Inductive)

±0.1

Degrees(

°) max AC/DC = 0 and AC/DC = 1

AC Power Supply Rejection

1

AC/

DC = 1, S0 = S1 = 1, G0 = G1 = 0

Output Frequency Variation (CF)

0.01

% Reading typ

V1 = 100 mV rms, V2 = 100 mV rms @ 50 Hz

Ripple on AVDD of 200 mV rms @ 100 Hz

DC Power Supply Rejection

1

AC/

DC = 1, S0 = S1 = 1, G0 = G1 = 0

Output Frequency Variation (CF)

0.01

% Reading typ

V1 = 100 mV rms, V2 = 100 mV rms,

AVDD = AVDD = 5 V ± 250 mV

FAULT DETECTION

1, 2

See Fault Detection Section, PF = 1

Fault Detection Threshold

Inactive i/p <> Active i/p

12.5

% typ

(V1A or V1B Active)

Input Swap Threshold

Inactive i/p > Active i/p

14

% of Active typ

(V1A or V1B Active)

Accuracy Fault Mode Operation

V1A Active, V1B = AGND

0.1

% Reading typ

Over a Dynamic Range 500 to 1

V1B Active, V1A = AGND

0.1

% Reading typ

Over a Dynamic Range 500 to 1

Fault Detection Delay

3

Second typ

Swap Delay

3

Second typ

ANALOG INPUTS

See Analog Inputs Section

Maximum Signal Levels

±1

V max

V1A, V1B, V1N, V2N and V2P to AGND

Input Impedance (DC)

400

k

Ω min

CLKIN = 3.58 MHz

Bandwidth

14

kHz typ

CLKIN/256, CLKIN = 3.58 MHz

ADC Offset Error

1

±15

mV max

See Terminology and

Gain Error

1

±4

% Ideal typ

External 2.5 V Reference, Gain = 1,

V1 = V2 = 660 mV dc

Gain Error Match

1

±0.2

% Ideal typ

External 2.5 V Reference

REFERENCE INPUT

REFIN/OUT Input Voltage Range

2.7

V max

2.5 V + 8%

2.3

V min

2.5 V – 8%

Input Impedance

3.7

k

Ω min

Input Capacitance

10

pF max

ON-CHIP REFERENCE

Nominal 2.5 V

Reference Error

±200

mV max

Temperature Coefficient

30

ppm/

°C typ

60

ppm/

°C max

CLKIN

Note All Specifications for CLKIN of 3.58 MHz

Input Clock Frequency

4

MHz max

1

MHz min

LOGIC INPUTS

3

SCF, S0, S1, AC/

DC,

RESET, G0 and G1

Input High Voltage, VINH

2.4

V min

DVDD = 5 V ± 5%

Input Low Voltage, VINL

0.8

V max

DVDD = 5 V ± 5%

Input Current, IIN

±3

µA max

Typically 10 nA, VIN = 0 V to DVDD

Input Capacitance, CIN

10

pF max

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