參數(shù)資料
型號(hào)： LTC2291CUP#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 11/28頁(yè)
文件大?。?/td> 0K
描述： IC ADC DUAL 12BIT 25MSPS 64QFN
標(biāo)準(zhǔn)包裝： 2,000
位數(shù)： 12
采樣率（每秒）： 25M
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 2
功率耗散（最大）： 180mW
電壓電源： 單電源
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 64-WFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 64-QFN（9x9）
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 2 個(gè)單端，雙極; 2 個(gè)差分, 雙極
LTC2293/LTC2292/LTC2291
19
229321fa
APPLICATIO S I FOR ATIO
WU
UU
Reference Operation
Figure 9 shows the LTC2293/LTC2292/LTC2291 refer-
ence circuitry consisting of a 1.5V bandgap reference, a
difference amplifier and switching and control circuit. The
internal voltage reference can be configured for two pin
selectable input ranges of 2V (
±1V differential) or 1V
(
±0.5V differential). Tying the SENSE pin to VDD selects
the 2V range; tying the SENSE pin to VCM selects the 1V
range.
The 1.5V 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 is required for
the 1.5V reference output, VCM. This provides a high
frequency low impedance path to ground for internal and
external circuitry.
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. The multiple output
pins are needed to reduce package inductance. Bypass
capacitors must be connected as shown in Figure 9. Each
ADC channel has an independent reference with its own
bypass capacitors. The two channels can be used with the
same or different input ranges.
Other voltage ranges between the pin selectable ranges
can be programmed with two external resistors as shown
in Figure 10. 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. The SENSE pin should be tied to the appropriate
level 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.
For the best channel matching, connect an external reference
to SENSEA and SENSEB.
Figure 10. 1.5V Range ADC
Figure 9. Equivalent Reference Circuit
VCM
REFH
SENSE
TIE TO VDD FOR 2V RANGE;
TIE TO VCM FOR 1V RANGE;
RANGE = 2 VSENSE FOR
0.5V < VSENSE < 1V
1.5V
REFL
2.2
F
2.2
F
INTERNAL ADC
HIGH REFERENCE
BUFFER
0.1
F
229321 F09
4
DIFF AMP
1
F
1
F
INTERNAL ADC
LOW REFERENCE
1.5V BANDGAP
REFERENCE
1V
0.5V
RANGE
DETECT
AND
CONTROL
LTC2293/LTC2292/LTC2291
VCM
SENSE
1.5V
0.75V
2.2
F
12k
1
F
12k
229321 F10
LTC2293
LTC2292
LTC2291
Input Range
The input range can be set based on the application. The
2V input range will provide the best signal-to-noise perfor-
mance while maintaining excellent SFDR. The 1V input
range will have better SFDR performance, but the SNR will
degrade by 3.8dB. See the Typical Performance Charac-
teristics section.
Driving the Clock Input
The CLK inputs can be driven directly with a CMOS or TTL
level signal. A sinusoidal clock can also be used along with
a low jitter squaring circuit before the CLK pin (Figure 11).
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參數(shù)描述
LTC2291IUP 制造商:Linear Technology 功能描述:MS-ADC/High Speed, Dual 12-bit, 25Msps Low Power ADC
LTC2291IUP#PBF 功能描述:IC ADC DUAL 12BIT 25MSPS 64QFN RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個(gè)單端，單極；2 個(gè)差分，單極 產(chǎn)品目錄頁(yè)面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6
LTC2291IUP#TRPBF 功能描述:IC ADC DUAL 12BIT 25MSPS 64QFN RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個(gè)單端，單極；1 個(gè)單端，雙極
LTC2291UP 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual 12-Bit, 65/40/25Msps Low Power 3V ADCs
LTC2292 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual 12-Bit, 65/40/25Msps Low Power 3V ADCs
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