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dc2319af
DEMO MANUAL DC2319A
harDware configuration
DC2319A F02
V
IN
+
V
OUT
–
V
OUT
+
V
+
V
–
V
IN
–
EXT
VOCM
R2, 1k
R4, 1k
R1, 1k
R3, 1k
–
+ –
+
LTC6363
DC2319A F03
V
IN
+
V
OUT
–
V
OUT
+
V
+
V
–
V
IN
–
EXT
VOCM
–
+ –
+
LTC6363-X
Internal or External Gain Settings
Table 1 summarizes the gain settings for the various ver-
sions of DC2319A.
The LTC6363 (without suffix) is a non-committed op amp,
which requires external feedback resistors to configure the
gain. On the DC2319A-A, these resistors (R1, R2, R3, R4)
are all set to 1k to configure a gain of G = 1, as shown in
Figure 2. To set other gains, simply replace these resistors
with other values.
The versions of LTC6363 with suffix (LTC6363-1,
LTC6363-2, LTC6363-05) include precision gain resistors
internal to the IC. The IC already sets its own gain, to
G = 1, G = 2 and G = 0.5 respectively, according to the suffix
(see Table 1). Therefore, on DC2319A-B, DC2319A-C and
DC2319A-D, the onboard feedback resistors (R3, R4) are
not populated, and the input resistors (R1, R2) are shorted
to 0Ω, resulting in the circuit of Figure 3.
Figure 3. DC2319A-B/-C/-D with Gain Setting Resistors
Internal to the IC (LTC6363-1/-2/-05)
Figure 2. DC2319A-A with External Gain Setting Resistors (LTC6363)