ACPL-7970-000E 데이터 시트보기 (PDF) - Avago Technologies

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ACPL-7970-000E

Optically Isolated Sigma-Delta Modulator

Avago Technologies 

Table 7. Electrical Specifications

Unless otherwise noted, TA = -40° C to +105° C, VDD1 = 4.5 V to 5.5 V, VDD2 = 3 V to 5.5 V, VIN+ = -200 mV to +200 mV, and

VIN– = 0 V (single-ended connection); tested with Sinc3 filter, 256 decimation ratio.

Parameter

Symbol Min. Typ.[1] Max. Units Test Conditions/Notes

Fig.

STATIC CHARACTERISTICS

Resolution

16

Bits

Decimation filter output set to 16 bits

Integral Nonlinearity

INL

-15 3

15 LSB

TA = -40° C to +85° C; see Definitions

section

-25 3

25 LSB

TA = 85° C to 105° C

Differential Nonlinearity

DNL

-0.9

0.9 LSB

No missing codes, guaranteed by

design; see Definitions section

Offset Error

VOS

-2 0.4 2

mV

TA = -40° C to +105° C;

5

see Definitions section

Offset Drift vs. Temperature

Offset Drift vs. VDD1

TCVOS

2

6

220

mV/°C

mV/V

VDD1 = 5 V

Internal Reference Voltage

VREF

320

mV

Reference Voltage Tolerance

GE

-1

1

%

TA = 25° C, VIN+ = -320 to +320 mV;

see Definitions section

-2

2

%

TA = -40° C to +105° C,

6

VIN+ = -320 to +320 mV

VREF Drift vs. Temperature

TCGE

60

ppm/°C

VREF Drift vs. VDD1

-1.3

mV/V Note 4

ANALOG INPUTS

Full-Scale Differential Voltage FSR

Input Range

320

mV

VIN = VIN+ – VIN–; Note 2

Average Input Bias Current

IINA

-0.3

mA

VDD1 = 5V, VDD2 = 5V, VIN+ = 0 V;

7

Note 3

Average Input Resistance

RIN

Input Capacitance

CINA

24

kΩ

Across VIN+ or VIN– to GND1; Note 3

8

pF

Across VIN+ or VIN– to GND1

DYNAMIC CHARACTERISTICS

VIN+ = 400 mVpp, 1 kHz sine wave

Signal-to-Noise Ratio

SNR

68 78

dB

TA = -40° C to +105° C;

8

see Definitions section

Signal-to-(Noise + Distortion) SNDR 65 75

dB

TA = -40° C to +105° C;

9

Ratio

see Definitions section

Effective Number of Bits

ENOB

12

Bits

see Definitions section

Isolation Transient Immunity

CMR

25

kV/ms VCM = 1 kV; See Definitions section

Common-Mode Rejection Ratio CMRR

74

dB

DIGITAL OUTPUTS

Output High Voltage

VOH

VDD2 – VDD2 –

V

0.2 0.1

IOUT = -200 mA

Output Low Voltage

VOL

0.6 V

IOUT = +1.6 mA

POWER SUPPLY

VDD1 Supply Current

IDD1

9

14 mA

VIN+ = –320 mV to +320 mV

10

VDD2 Supply Current

IDD2

5.2 8

mA

VDD2 = 5 V supply

11

4.6 7

mA

VDD2 = 3.3 V supply

12

Notes:

1. All Typical values are at TA = 25° C, VDD1 = 5 V, VDD2 = 5 V.

2. Beyond the full-scale input range the data output is either all zeroes or all ones.

3. Because of the switched-capacitor nature of the isolated modulator, time averaged values are shown.

4. VREF Drift vs. VDD1 can be expressed as –0.4%/V with reference to VREF.

7

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