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參數(shù)資料
| 型號(hào)： | LTC1279C |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 12-Bit, 600ksps Sampling A/D Converter with Shutdown |
| 中文描述： | 12位，600ksps與關(guān)機(jī)采樣A / D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 327K |
| 代理商： | LTC1279C |
11
LTC1279
APPLICATIO
S I
FOR
ATIO
U
op amps are used, more settling time can be provided by
increasing the time between conversions. Suitable de-
vices capable of driving the ADC’s A
IN
input include the
LT
1360, LT1220, LT1223 and LT1224 op amps.
W
U
U
the internal reference so driving the reference is not
recommended, since the input span will exceed the supply
and codes will be lost at the full scale.) Figure 7 shows a
typical reference, the LT1019A-2.5 connected to the
LTC1279. This will provide an improved drift (equal to the
LT1019A-2.5’s maximum of 5ppm/
°
C) and a
±
2.582V full
scale.
UNIPOLAR/BIPOLAR OPERATION AND ADJUSTMENT
Figure 8a shows the ideal input/output characteristics for
the LTC1279. The code transitions occur midway between
successive integer LSB values (i.e., 0.5LSB, 1.5LSB,
2.5LSB, ... FS – 1.5LSB). The output code is naturally
binary with 1LSB = FS/4096 = 5V/4096 = 1.22mV. Figure
8b shows the input/output transfer characteristics for the
bipolar mode in two’s complement format.
Internal Reference
The LTC1279 has an on-chip, temperature compensated,
curvature corrected, bandgap reference that is factory
trimmed to 2.42V. It is internally connected to the DAC and
is available at pin 2 to provide up to 800
μ
A current to an
external load.
For minimum code transition noise, the reference output
should be decoupled with a capacitor to filter wideband
noise from the reference (10
μ
F tantalum in parallel with a
0.1
μ
F ceramic).
The V
REF
pin can be driven with a DAC or other means to
provide input span adjustment in bipolar mode. The V
REF
pin must be driven to at least 2.45V to prevent conflict with
the internal reference. The reference should be driven to
no more than 4.8V to keep the input span within the
±
5V
supplies.
Figure 6 shows an LT1006 op amp driving the V
REF
pin. (In
the unipolar mode, the input span is already 0V to 5V with
Figure 8b. LTC1279 Bipolar Transfer Characteristics
Figure 7. Supplying a 2.5V Reference Voltage
to the LTC1279 with the LT1019A-2.5
Figure 8a. LTC1279 Unipolar Transfer Characteristics
V
REF(OUT)
≥
2.45V
3
INPUT RANGE
±
1.033
×
V
REF(OUT)
–
+
LT1006
5V
–5V
LTC1279
A
IN
AGND
V
REF
10
μ
F
1279 F06
Figure 6. Driving the V
REF
with the LT1006 Op Amp
3
INPUT RANGE
±
2.58V
(=
±
1.033
×
V
REF
)
10
μ
F
1279 F07
LT1019A-2.5
V
IN
GND
V
OUT
5V
5V
–5V
LTC1279
A
IN
AGND
V
REF
INPUT VOLTAGE (V)
0V
O
–1
LSB
1279 F08b
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 = 5V
1LSB = FS/4096
INPUT VOLTAGE (V)
0V
O
FS – 1LSB
1279 F08a
111...111
111...110
111...101
111...100
000...000
000...001
000...010
000...011
1
LSB
UNIPOLAR
ZERO
1LSB =
FS
4096
5V
4096
=
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