LM98640CVAL datasheet(14/55 Pages) TI2

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LM98640QML-SP

SNAS461G – MAY 2010 – REVISED NOVEMBER 2018

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LM98640QML-SP Electrical Characteristics

(1)(2) (continued)

The following specifications apply for VDD33 = 3.3 V, VDD18 = 1.8 V, CL = 10 pF, and fINCLK = 40 MHz unless otherwise

specified.

PARAMETER

TEST CONDITIONS

NOTES

SUB-

GROUPS

MIN TYP(3)

MAX UNIT

PGA SPECIFICATIONS

Gain Resolution

1, 2, 3

Bits

Monotonicity

See(5)

Maximum Gain

CDS Gain = 1x

1, 2, 3

7.92

8.3

8.78

V/V

CDS Gain = 1x

1, 2, 3

17.99

18.4

18.88

Minimum Gain

CDS Gain = 1x

1, 2, 3

0.62

0.64

0.66

V/V

CDS Gain = 1x

1, 2, 3

–4.15

–3.8

–3.54

PGA Function

Gain (V/V) = (180/(277-PGA Code))

Gain (dB) = 20LOG10(180/(277-PGA Code))

Channel Matching

Minimum PGA Gain

1, 2

95.2%

99.0%

94.0%

99.0%

Maximum PGA Gain

1, 2

95.2%

99.0%

94.0%

99.0%

ADC SPECIFICATIONS

VREFT

Top of Reference

2.0

VREFB

Bottom of Reference

1.0

VREFT - VREFB Differential Reference Voltage

1.0

Overrange Output Code

1, 2, 3

16383

Code

Underrange Output Code

1, 2, 3

0 Code

FULL CHANNEL PERFORMANCE SPECIFICATIONS

DNL

Differential Non-Linearity

5 MHz

1, 2, 3

–1.03

0.78

1.53

LSB

5 MHz CDS

1, 2, 3

–1.20

1.0

2.24

15 MHz

0.78

25 MHz

0.78

40 MHz

1, 2, 3

–1.03

0.78

1.45

INL

Integral Non-Linearity

5 MHz

1, 2, 3

–5.38

1.7

4.38

LSB

5 MHz CDS

1, 2, 3

–3.41

1.7

5.15

15 MHz

1.9

25 MHz

2.4

40 MHz

1, 2, 3

–9.9

6.0

7.34

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