REFERENCE

TLV56xx

V(REF)

Pin 16

10 F

m

100pF

REF

BUFFERED AMPLIFIER

TLV5630

TLV5631

TLV5632

www.ti.com .................................................................................................................................................... SLAS269F – MAY 2000 – REVISED NOVEMBER 2008

The DAC reference can be sourced internally or externally by programming bits D2 (R1) and D1 (R0) of the

CTRL0 register (address = 08h). If an external source of reference is applied to the REF pin, the device must be

configured to accept the external reference source by setting R1 and R0 to 00 or 01. If R1 and R0 is set to select

for internal reference, a voltage of 1.024 V (if R1 and R0 = 10) or 2.048 V (if R1 and R0 = 11) is available. The

internal reference can source up to 1 mA, therefore. it can be used as an external system reference. A

decoupling capacitor must be connected to the REF pin if internal reference is selected to ensure output stability.

A 1

µF to 10 µF capacitor in parallel to a 100 pF capacitor should be sufficient, see Figure 13.

Figure 13. Reference Pin Decoupling Connection

The DAC outputs are buffered by an amplifier with a gain of two, which are configurable as Class A (fast mode)

or Class AB (slow or low-power mode). The output buffers have near rail-to-rail output with short-circuit

protection, and can reliably drive a 2-k

Ω load with a 100-pF load capacitance.

Copyright © 2000–2008, Texas Instruments Incorporated

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