6420EVM View Datasheet(PDF) - Semtech Corporation

Part Name

Description

Manufacturer

6420EVM

Per-Pin Electronics Companion DAC

Semtech Corporation 

HIGH-PERFORMANCE PRODUCTS – ATE

Circuit Description (continued)

Offset

The typical offset for each current DAC is governed by the

following equations:

IOFFSET_E = – KGE * VREF

R_GAIN_E

*

128

MAX_COUNT_E

Equation 6.

IOFFSET_F = 0

Group E DACs

There are 2 Group E DACs/channel. Group E DACs are

characterized by:

• Current outputs (current flows out of the chip)

• 13 bit resolution

• Fixed offset (–128 * LSB typical)

• Adjustable full scale range (but < 3.6 mA).

The output current equation for Group E DACs is:

IOUT_E =

DATA

200

8192 * R_GAIN_E

– 3.125

R_GAIN_E

where:

55 kΩ ≤ R_GAIN_E ≤ 156 kΩ

Note: VREF = 2.5V

Group F DACs

There are 3 Group F DACs/channel. Group F DACs are

characterized by:

• Current outputs (current flows out of the chip)

• 6 bit resolution

• Fixed offset (0 typical)

• Adjustable full scale range (but < 3.6 mA).

The output current equation for Group F DACs is:

where:

IOUT_F =

DATA

200

64 * R_GAIN_F

55 kΩ ≤ R_GAIN_F ≤ 156 kΩ

Note: VREF = 2.5V

 2000 Semtech Corp.

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