DAC5662 Datasheet, PDF (19/25 Pages) Texas Instruments – DUAL, 12-BIT 200 MSPS DIGITAL-TO-ANALOG CONVERTER

DAC5662
www.ti.com ................................................................................................................................................................ SLAS425B – JULY 2004 – REVISED MAY 2007
Gain Setting Option
The full-scale output current on the DAC5662 can be set two ways: either for each of the two DAC channels
independently or for both channels simultaneously. For the independent gain set mode, the GSET pin (pin 42)
must be low (i.e. connected to AGND). In this mode, two external resistors are required — one RSET connected
to the BIASJ_A pin (pin 44) and the other to the BIASJ_B pin (pin 41). In this configuration, the user has the
flexibility to set and adjust the full-scale output current for each DAC independently, allowing for the
compensation of possible gain mismatches elsewhere within the transmit signal path.
Alternatively, bringing the GSET pin high (i.e. connected to AVDD), the DAC5662 switches into the simultaneous
gain set mode. Now the full-scale output current of both DAC channels is determined by only one external RSET
resistor connected to the BIASJ_A pin. The resistor at the BIASJ_B pin may be removed, however this is not
required since this pin is not functional in this mode and the resistor has no effect on the gain equation.
Sleep Mode
The DAC5662 features a power-down function which can be used to reduce the total supply current to less than
3.5 mA over the specified supply range if no clock is present. Applying a logic high to the SLEEP pin initiates the
power-down mode, while a logic low enables normal operation. When left unconnected, an internal active
pulldown circuit enables the normal operation of the converter.
Copyright © 2004–2007, Texas Instruments Incorporated
Product Folder Link(s): DAC5662
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