參數資料
| 型號： | LTC2295CUP#PBF |
| 廠商： | Linear Technology |
| 文件頁數： | 6/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC DUAL 14BIT 10MSPS 64QFN |
| 標準包裝： | 40 |
| 位數： | 14 |
| 采樣率（每秒）： | 10M |
| 數據接口： | 并聯 |
| 轉換器數目： | 2 |
| 功率耗散（最大）： | 138mW |
| 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 |
| 供應商設備封裝： | 64-QFN（9x9） |
| 包裝： | 管件 |
| 輸入數目和類型： | 2 個單端，雙極; 2 個差分, 雙極 |
LTC2295
2295fa
14
APPLICATIO S I FOR ATIO
WU
UU
Figure 4 demonstrates the use of a differential amplifier to
convert a single ended input signal into a differential input
signal. The advantage of this method is that it provides low
frequency input response; however, the limited gain band-
width of most op amps will limit the SFDR at high input
frequencies.
Figure 5. Single-Ended Drive
Figure 4. Differential Drive with an Amplifier
25
25
12pF
2.2
F
VCM
2295 F04
–
+
CM
ANALOG
INPUT
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
AIN
+
AIN
–
LTC2295
25
0.1
F
ANALOG
INPUT
VCM
AIN
+
AIN
–
1k
12pF
2295 F05
2.2
F
1k
25
0.1
F
LTC2295
Reference Operation
Figure 6 shows the LTC2295 reference circuitry consisting
of a 1.5V 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 (
±1Vdifferential)or1V(±0.5Vdifferential).Tyingthe
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.
Figure 6. 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
2295 F06
4
DIFF AMP
1
F
1
F
INTERNAL ADC
LOW REFERENCE
1.5V BANDGAP
REFERENCE
1V
0.5V
RANGE
DETECT
AND
CONTROL
LTC2295
Figure 5 shows a single-ended input circuit. The imped-
ance seen by the analog inputs should be matched. This
circuit is not recommended if low distortion is required.
The 25
resistorsand12pFcapacitorontheanaloginputs
serve two purposes: isolating the drive circuitry from the
sample-and-hold charging glitches and limiting the
wideband noise at the converter input.
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| LTC2295IUP | 制造商:Linear Technology 功能描述:ADC Dual Pipelined 10Msps 14-bit Parallel 64-Pin QFN EP |
| LTC2295IUP#PBF | 功能描述:IC ADC DUAL 14BIT 10MSPS 64QFN RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極 |
| LTC2295IUP#TRPBF | 功能描述:IC ADC DUAL 14BIT 10MSPS 64QFN RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極 |
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