6420EVM View Datasheet(PDF) - Semtech Corporation

Part Name

Description

Manufacturer

6420EVM

Per-Pin Electronics Companion DAC

Semtech Corporation 

Edge6420

HIGH-PERFORMANCE PRODUCTS – ATE

Circuit Description (continued)

Group A DACs

Group D DACs

There are five Group A DACs/channel. Group A DACs have There are two Group D DACs/channel. Group D DACs

a centralized offset, gain and range that is independent of have a centralized offset, gain and range that is

any other group.

independent of any other group.

Group A DACs are characterized by 13 bit resolution and

their typical outputs are governed by the following equation:

VOUT_A = 10 *

R_GAIN_A

DATA

R_MASTER * 8192

+ VOFFSET_A

where:

VOFFSET_A =

R_OFFSET_A

5 * .5 –

R_MASTER

Note: VREF = 2.5V

Group B DACs

There are two Group B DACs/channel. Group B DACs

have a centralized offset, gain and range that is

independent of any other group.

Group D DACs are characterized by 13 bit resolution and

their typical outputs are governed by the following

equation:

VOUT_D = 10 *

where:

R_GAIN_D

DATA

R_MASTER * 8192

+ VOFFSET_D

VOFFSET_D =

R_OFFSET_D

5 * .5 –

R_MASTER

Note: VREF = 2.5V

DAC Current Output Overview

The output current of Group E and F DACs is governed by

the following equation:

Group B DACs are characterized by 13 bit resolution and

their typical outputs are governed by the following

equation:.

VOUT_B = 10 *

R_GAIN_B

DATA

R_MASTER * 8192

+ VOFFSET_B

IOUT_[E:F] =

KG[E:F] * IREF_[E:F] *

DATA

MAX_COUNT_[E:F]

where:

Equation 5.

+ IOFFSET_[E:F]

where:

VOFFSET_B =

R_OFFSET_B

5 * .5 –

R_MASTER

Note: VREF = 2.5V

Group C DACs

There are two Group C DACs/channel. Group C DACs have

a centralized offset, gain and range that is independent of

any other group'.

Group C DACs are characterized by 13 bit resolution and

their typical outputs are governed by the following equation:

DATA corresponds to the base-10 value of the binary data

loaded into the shift resister in Figure 2.

IREF_[E:F] =

VREF

R_GAIN_[E:F]

KG[E:F] is a multiplying factor that is fixed, as follows:

KGE = 80 KGF = 80

VREF = 2.5V

MAX_COUNT_E = 8192

MAX_COUNT_F = 64

VOUT_C = 20 *

where:

R_GAIN_C

DATA

R_MASTER * 8192

+ VOFFSET_C

VOFFSET_C =

R_OFFSET_C

5 * .5 –

R_MASTER

Note: VREF = 2.5V

 2000 Semtech Corp.

8

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