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參數(shù)資料
| 型號： | LTC2206 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-Bit, 105Msps/80Msps ADCs |
| 中文描述： | 16位，105Msps/80Msps模數(shù)轉(zhuǎn)換器 |
| 文件頁數(shù)： | 20/32頁 |
| 文件大?。?/td> | 1489K |
| 代理商： | LTC2206 |
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LTC2207/LTC2206
20
22076fa
Figure 5. DC Coupled Input with Differential Amplifier
–
–
+
+
A
IN+
A
IN–
2.2
μ
F
12pF
12pF
V
CM
LTC2207/
LTC2206
ANALOG
INPUT
22076 F05
CM
AMPLIFIER = LTC6600-20,
LTC1993, ETC.
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
25
25
PGA
1.25V
SENSE
V
CM
BUFFER
INTERNAL
ADC
REFERENCE
RANGE
SELECT
AND GAIN
CONTROL
2.5V
BANDGAP
REFERENCE
2.2
μ
F
TIE TO V
TO USE
INTERNAL 2.5V
REFERENCE
OR INPUT FOR
EXTERNAL 2.5V
REFERENCE
OR INPUT FOR
EXTERNAL 1.25V
REFERENCE
22076 F06
LTC2207/
LTC2206
Figure 6. Reference Circuit
Direct Coupled Circuits
Figure 5 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
bandwidth of any op amp or closed-loop amplifier will de-
grade the ADC SFDR at high input frequencies. Additionally,
wideband op amps or differential amplifiers tend to have
high noise. As a result, the SNR will be degraded unless
the noise bandwidth is limited prior to the ADC input.
Reference Operation
Figure 6 shows the LTC2207/LTC2206 reference circuitry
consisting of a 2.5V bandgap reference, a programmable
gain amplifier and control circuit. The LTC2207/LTC2206
have three modes of reference operation: Internal Refer-
ence, 1.25V external reference or 2.5V external reference.
To use the internal reference, tie the SENSE pin to V
DD
. To
use an external reference, simply apply either a 1.25V or
2.5V reference voltage to the SENSE input pin. Both 1.25V
and 2.5V applied to SENSE will result in a full scale range
of 2.25V
P-P
(PGA = 0). A 1.25V output V
CM
is provided
for a common mode bias for input drive circuitry. An
external bypass capacitor is required for the V
CM
output.
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 minimum value required
for stability is 2.2μF.
The internal programmable gain amplifier provides the
internal reference voltage for the ADC. This amplifier has
very stringent settling requirements and is not accessible
for external use.
The SENSE pin can be driven ±5% around the nominal 2.5V
or 1.25V external reference inputs. This adjustment range
can be used to trim the ADC gain error or other system
gain errors. When selecting the internal reference, the
SENSE pin should be tied to V
DD
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 1μF (or larger) ceramic capacitor.
PGA Pin
The PGA pin selects between two gain settings for the
ADC front-end. PGA = 0 selects an input range of 2.25V
P-
P
; PGA = 1 selects an input range of 1.5V
P-P
. The 2.25V
input range has the best SNR; however, the distortion will
be higher for input frequencies above 100MHz. For ap-
plications with high input frequencies, the low input range
will have improved distortion; however, the SNR will be
2.4dB worse. See the Typical Performance Characteristics
section of this datasheet.
APPLICATIONS INFORMATION
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC2206CUK | 16-Bit, 105Msps/80Msps ADCs |
| LTC2206IUK | 16-Bit, 105Msps/80Msps ADCs |
| LTC2206UK | 16-Bit, 105Msps/80Msps ADCs |
| LTC2207 | 16-Bit, 105Msps/80Msps ADCs |
| LTC2207CUK | 16-Bit, 105Msps/80Msps ADCs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC2206CUK | 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 105Msps/80Msps ADCs |
| LTC2206CUK#PBF | 制造商:Linear Technology 功能描述:Single ADC Pipelined 80Msps 16-bit Parallel 48-Pin QFN EP 制造商:Linear Technology 功能描述:IC ADC 16-BIT 80MSPS 48-QFN 制造商:Linear Technology 功能描述:MS-ADC/High Speed, 16-bit, 80Msps ADC 制造商:Linear Technology 功能描述:IC, ADC, 16BIT, 80MSPS, QFN-48, Resolution (Bits):16bit, Sampling Rate:80MSPS, Supply Voltage Type:Single, Supply Voltage Min:3.135V, Supply Voltage Max:3.465V, Supply Current:220mA, Digital IC Case Style:QFN, No. of Pins:48 , RoHS Compliant: Yes |
| LTC2206CUK#TRPBF | 制造商:Linear Technology 功能描述:IC ADC 16-BIT 80MSPS 48-QFN |
| LTC2206CUK-14 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:14-Bit, 105Msps/80Msps ADCs |
| LTC2206CUK-14#PBF | 功能描述:IC ADC 14BIT 80MSPS 48-QFN 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 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)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(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個(gè)單端，雙極 |
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