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參數(shù)資料
| 型號(hào)： | LTC1606 |
| 廠(chǎng)商： | Linear Technology Corporation |
| 英文描述： | 16-Bit, 250ksps, Single Supply ADC |
| 中文描述： | 16位，250ksps的，單電源模數(shù)轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 169K |
| 代理商： | LTC1606 |
8
LTC1606
Internal Voltage Reference
The LTC1606 has an on-chip, temperature compensated,
curvature corrected, bandgap reference, which is factory
trimmed to 2.50V. The full-scale range of the ADC is equal
to (
±
4 V
REF
) or nominally
±
10V. The output of the
reference is connected to the input of a buffer (1.64x)
through a 4k resistor (see Figure 3). The input to the buffer
or the output of the reference is available at REF (Pin 3).
The internal reference can be overdriven with an external
reference if more accuracy is needed. The buffer output
drives the internal DAC and is available at CAP (Pin 4). The
CAP pin can be used to drive a steady DC load of less than
2mA. Driving an AC load is not recommended because it
can cause the performance of the converter to degrade.
For minimum code transition noise, the REF pin and the
CAP pin should each be decoupled with a capacitor to
filter wideband noise from the reference and the buffer
(2.2
μ
F tantalum for the REF pin and 10
μ
F tantalum for the
CAP pin).
Offset and Gain Adjustments
The LTC1606 offset and full-scale errors have been trimmed
at the factory with the external resistors shown in Figure
4. This allows for external adjustment of offset and full
scale in applications where absolute accuracy is impor-
tant. See Figure 5 for the offset and gain trim circuit. First,
adjust the offset to zero by adjusting resistor R3. Apply an
input voltage of –152.6
μ
V (–0.5LSB) and adjust R3 so the
code is changing between 1111 1111 1111 1111 and 0000
0000 0000 0000. The gain error is trimmed by adjusting
resistor R4. An input voltage of 9.999542V (+FS – 1.5LSB)
is applied to V
IN
and R4 is adjusted until the output code
is changing between 0111 1111 1111 1110 and 0111
1111 1111 1111. Figure 6 shows the bipolar transfer
characteristic of the LTC1606.
Figure 3. Internal or External Reference Source
APPLICATIO
S I
N
FOR
ATIO
U
W
U
+
5
4
3
2
1
10
μ
F
+
2.2
μ
F
33.2k
1%
±
10V INPUT
200
1%
V
IN
AGND1
REF
CAP
AGND2
LTC1606
1606 F04
Figure 4.
±
10V Input Without Trim
+
5
4
3
2
1
10
μ
F
+
2.2
μ
F
33.2k
1%
±
10V INPUT
200
1%
V
IN
AGND1
REF
CAP
AGND2
LTC1606
1606 F05
576k
R4
50k
R3
50k
5V
Figure 5.
±
10V Input with Offset and Gain Trim
INPUT VOLTAGE (V)
0V
O
–1
LSB
1606 F06
011...111
011...110
000...001
000...000
100...000
100...001
111...110
1
LSB
BIPOLAR
ZERO
111...111
FS/2 – 1LSB
–FS/2
FS = 20V
1LSB = FS/65536
Figure 6. LTC1606 Bipolar Transfer Characteristics
–
+
1606 F03
INTERNAL
CAPACITOR
DAC
BANDGAP
REFERENCE
4k
10
μ
F
CAP
(4.096V)
2.2
μ
F
REF
(2.5V)
4
3
R
0.64R
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