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TDA8706

6-bit analog-to-digital converter with multiplexer and clamp

Philips Electronics 

Philips Semiconductors

6-bit analog-to-digital converter with

multiplexer and clamp

Preliminary specification

TDA8706

Notes to the characteristics

1. Low frequency ramp signal (VVI(p-p) = 1.8 V and fi = 15 kHz) combined with a sinewave input voltage (VVI(p-p) = 0.5 V

and fi = 4.43 MHz) at the input.

2. Supply voltage ripple rejection (SVRR): variation of the input voltage produces output code 31 for a supply voltage

variation of 1 V.

SVRR = 20 log∆---∆--V--V--V--C-i--(-C-3--A-1--)-

3. Full-scale sinewave; fi = 4.43 MHz, fCLK = 20 MHz.

Table 1 Output coding

STEP

Underflow

0

1

.

.

.

62

63

Overflow

VI(1)

(TYP. VALUE)

<2.2 V

2.2 V

2.215 V

3.072 V

3.086 V

>3.1 V

Note

1. With clamping capacitance.

BINARY

OUTPUTS

D5 TO D0

000000

000000

000001

......

......

......

111110

111111

111111

Table 3 Clamp input A

A

CLAMP

0

1

1

1

Note

1. X = don’t care.

DIGITAL

OUTPUTS

X(1)

0

VinA

2.2

2.2

Table 4 Clamp input B and C

B/C

CLAMP

DIGITAL

OUTPUTS

0

1

X(1)

1

1

32

Note

1. X = don’t care.

VinB/VinC

2.65

2.65

Table 2 Mode selection

CEN

1

0

D0 TO D5

high impedance

active; binary

1996 Aug 20

8

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