TLV1562CPWG4 datasheet(10/42 Pages) TI1

Part #	TLV1562CPWG4

Description	2.7 V TO 5.5 V, HIGH-SPEED LOW-POWER RECONFIGURABLE ANALOG-TO-DIGITAL CONVERTER WITH 4-INPUT, DUAL S/H, PARALLEL INTERFACE, AND POWER DOWN

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TLV1562

2.7 V TO 5.5 V, HIGH-SPEED LOW-POWER RECONFIGURABLE ANALOG-TO-DIGITAL

CONVERTER WITH 4-INPUT, DUAL S/H, PARALLEL INTERFACE, AND POWER DOWN

SLAS162 – SEPTEMBER 1998

10

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

reference voltage inputs

The TLV1562 has two reference input pins: REFP and REFM. The voltage levels applied to these pins establish

the upper and lower limits of the analog inputs to produce a full-scale and zero-scale reading respectively. The

values of VREFP, VREFM, and the analog input should not exceed the positive supply or be less than GND

consistent with the specified absolute maximum ratings. The digital output is at full scale when the input signal

is equal to or higher than VREFP and is at zero when the input signal is equal to or lower than VREFM. The

internal resistance from VREFP to VREFM may be as low as 20 k

Ω (±10%).

The reference voltages must satisfy the following conditions:

VREFP

≤ AVDD – 1 V,

AGND + 0.9 V < VREFM and

3 V

≥ (VREFP – VREFM) ≥ 0.8 V

VREFP

Cpad

= 10 pF

Cin = 1 pF

VREFM

Cpad

= 10 pF

Cin = 1 pF

10 k

Ω

10 k

Ω

VREFCM

Ron

Rs

Figure 7. Equivalent Circuit for Reference input

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