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參數(shù)資料
| 型號： | LTC1278-4IN |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC A/DCONV SAMPLNG W/SHTDN 24DIP |
| 標(biāo)準(zhǔn)包裝： | 15 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 400k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 150mW |
| 電壓電源： | 雙 ± |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 24-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 24-PDIP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個單端，單極；1 個單端，雙極 |
11
LTC1278
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
INPUT VOLTAGE (V)
0V
OUTPUT
CODE
–1
LSB
LTC1278 F8b
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
Figure 7. Supplying a 2.5V Reference Voltage to the LTC1278
with the LT1019A-2.5
Figure 8a. LTC1278 Unipolar Transfer Characteristics
conversion starts. Any op amp that settles in 200ns to
small current transients will allow maximum speed opera-
tion. If slower op amps are used, more settling time can be
provided by increasing the time between conversions.
Suitable devices capable of driving the ADC’s AIN input
include the LT1360, LT1220, LT1223 and LT1224 op
amps.
Internal Reference
The LTC1278 has an on-chip, temperature compensated,
curvature corrected, bandgap reference, which is factory
trimmed to 2.42V. It is internally connected to the DAC and
is available at Pin 2 to provide up to 1mA 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
F tantalum in parallel with a
0.1
F ceramic).
The VREF pin can be driven with a DAC or other means to
provide input span adjustment in bipolar mode. The VREF
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 reference
pin. (In the unipolar mode, the input span is already 0V to
5V with 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 LTC1278. This will provide an improved drift (equal to
the maximum 5ppm/
°CoftheLT1019A-2.5)anda±2.582V
full scale.
Figure 6. Driving the VREF with the LT1006 Op Amp
INPUT VOLTAGE (V)
0V
OUTPUT
CODE
FS – 1LSB
LTC1278 F8a
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
=
UNIPOLAR/BIPOLAR OPERATION AND ADJUSTMENT
Figure 8a shows the ideal input/output characteristics for
the LTC1278. 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.
Figure 8b. LTC1278 Bipolar Transfer Characteristics
VREF(OUT) ≥ 2.45V
3
INPUT RANGE
±1.033VREF(OUT)
5V
–5V
–
+
LT1006
LTC1278
AIN
AGND
VREF
10
F
LTC1278 F6
3
INPUT RANGE
±2.58V
(=
±1.033 × VREF)
LTC1278
AIN
AGND
VREF
10
F
LTC1278 F7
LT1019A-2.5
VIN
GND
VOUT
5V
–5V
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