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 Group D DACs are characterized by 13 bit resolution and
their typical outputs are governed by the following equation: their typical outputs are governed by the following
equation:
R_GAIN_A
DATA
8192
V
=
10
*
V
+
OUT_A
*
OFFSET_A
R_MASTER
R_GAIN_D
R_MASTER
DATA
8192
V
=
10
*
V
+
OUT_D
*
OFFSET_D
where:
where:
R_OFFSET_A
R_MASTER
V
=
5 * .5 –
OFFSET_A
R_OFFSET_D
R_MASTER
V
=
5 * .5 –
OFFSET_D
Note: V
= 2.5V
REF
Note: V
= 2.5V
REF
Group B DACs
DAC Current Output Overview
There are two Group B DACs/channel. Group B DACs
have a centralized offset, gain and range that is The output current of Group E and F DACs is governed by
independent of any other group.
the following equation:
DATA
I
=
K
* I
+
I
OFFSET_[E:F]
OUT_[E:F]
G[E:F] REF_[E:F]
*
Group B DACs are characterized by 13 bit resolution and
their typical outputs are governed by the following
equation:.
MAX_COUNT_[E:F]
Equation 5.
R_GAIN_B
DATA
8192
V
=
10
where:
V
+
*
OUT_B
*
OFFSET_B
R_MASTER
where:
DATA corresponds to the base-10 value of the binary data
loaded into the shift resister in Figure 2.
R_OFFSET_B
R_MASTER
V
=
5 * .5 –
OFFSET_B
V
REF
I
=
REF_[E:F]
R_GAIN_[E:F]
Note: V
= 2.5V
REF
K
G[E:F]
is a multiplying factor that is fixed, as follows:
Group C DACs
K
GE
= 80
K
GF
= 80
There are two Group C DACs/channel. Group C DACs have
a centralized offset, gain and range that is independent of
any other group'.
V
REF
= 2.5V
MAX_COUNT_E = 8192
MAX_COUNT_F = 64
Group C DACs are characterized by 13 bit resolution and
their typical outputs are governed by the following equation:
R_GAIN_C
R_MASTER
DATA
8192
V
=
20
*
V
+
OUT_C
*
OFFSET_C
where:
R_OFFSET_C
R_MASTER
V
=
5 * .5 –
OFFSET_C
Note: V
= 2.5V
REF
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