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參數資料
| 型號： | LTC1746IFW#PBF |
| 廠商： | Linear Technology |
| 文件頁數： | 6/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT 25MSPS LP 48TSSOP |
| 標準包裝： | 39 |
| 位數： | 14 |
| 采樣率（每秒）： | 25M |
| 數據接口： | 并聯 |
| 轉換器數目： | 1 |
| 功率耗散（最大）： | 465mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-TFSOP（0.240"，6.10mm 寬） |
| 供應商設備封裝： | 48-TSSOP |
| 包裝： | 管件 |
| 輸入數目和類型： | 2 個單端，雙極；1 個差分，雙極 |
14
LTC1746
1746f
APPLICATIO S I FOR ATIO
WU
UU
Reference Operation
Figure 5 shows the LTC1746 reference circuitry consisting
of a 2.35V bandgap reference, a difference amplifier and
switching and control circuit. The internal voltage refer-
ence can be configured for two pin selectable input ranges
of 2V(
±1V differential) or 3.2V(±1.6V differential). Tying
the SENSE pin to ground selects the 2V range; tying the
SENSE pin to VDD selects the 3.2V range.
The 2.35V bandgap reference serves two functions: its
output provides a DC bias point for setting the common
mode voltage of any external input circuitry; additionally,
the reference is used with a difference amplifier to gener-
ate the differential reference levels needed by the internal
ADC circuitry.
An external bypass capacitor of 4.7
F or larger is required
for the 2.35V reference output, VCM. This provides a high
frequency low impedance path to ground for internal and
external circuitry. This is also the compensation capacitor
for the reference. It will not be stable without this
capacitor.
The difference amplifier generates the high and low refer-
ence for the ADC. High speed switching circuits are
connected to these outputs and they must be externally
bypassed. Each output has two pins: REFHA and REFHB
for the high reference and REFLA and REFLB for the low
reference. The doubled output pins are needed to reduce
package inductance. Bypass capacitors must be con-
nected as shown in Figure 5.
Other voltage ranges in between the pin selectable ranges
can be programmed with two external resistors as shown
in Figure 6a. An external reference can be used by applying
its output directly or through a resistor divider to SENSE.
It is not recommended to drive the SENSE pin with a logic
device since the logic threshold is close to ground and
VDD. The SENSE pin should be tied high or low as close to
the converter as possible. If the SENSE pin is driven
externally, it should be bypassed to ground as close to the
device as possible with a 1
F ceramic capacitor.
VCM
REFHA
REFLB
SENSE
TIE TO VDD FOR 3.2V RANGE;
TIE TO GND FOR 2V RANGE;
RANGE = 2 VSENSE FOR
1V < VSENSE < 1.6V
2.35V
REFLA
REFHB
4.7
F
4.7
F
INTERNAL ADC
HIGH REFERENCE
BUFFER
0.1
F
1746 F05
LTC1746
4
DIFF AMP
1
F
1
F
0.1
F
INTERNAL ADC
LOW REFERENCE
2.35V BANDGAP
REFERENCE
1.6V
1V
RANGE
DETECT
AND
CONTROL
Figure 5. Equivalent Reference Circuit
VCM
SENSE
2.35V
1.1V
4.7
F
12.5k
1
F
11k
1746 F06a
LTC1746
VCM
SENSE
2.35V
5V
1.25V
6
4
1, 2
4.7
F
1
F
0.1
F
1746 F06b
LTC1746
LT1790-1.25
Figure 6a. 2.2V Range ADC
Figure 6b. 2.5V Range ADC with an External Reference
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