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參數(shù)資料
| 型號： | LTC2207-14 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 14-Bit, 105Msps/80Msps ADCs |
| 中文描述： | 14位，105Msps/80Msps模數(shù)轉(zhuǎn)換器 |
| 文件頁數(shù)： | 20/32頁 |
| 文件大小： | 1298K |
| 代理商： | LTC2207-14 |
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LTC2207-14/LTC2206-14
20
220714614fa
Figure 5. DC Coupled Input with Differential Amplifier
–
–
+
+
A
IN+
A
IN–
2.2
μ
F
12pF
12pF
V
CM
LTC2207-14/
LTC2206-14
ANALOG
INPUT
22076 F05
CM
AMPLIFIER = LTC6600-20,
LT1993, 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
LTC2207-14/
LTC2206-14
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 LTC2207-14/LTC2206-14 refer-
ence circuitry consisting of a 2.5V bandgap reference,
a programmable gain amplifier and control circuit. The
LTC2207-14/LTC2206-14 have three modes of reference
operation: Internal Reference, 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 distor-
tion will be higher for input frequencies above 100MHz.
For applications with high input frequencies, the low input
range will have improved distortion; however, the SNR
will be worse by up to approximately 2dB. See the Typical
Performance Characteristics section.
APPLICATIONS INFORMATION
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC2207CUK-14 | 14-Bit, 105Msps/80Msps ADCs |
| LTC2207IUK-14 | 14-Bit, 105Msps/80Msps ADCs |
| LTC2207UK-14 | 14-Bit, 105Msps/80Msps ADCs |
| LTC2206 | 16-Bit, 105Msps/80Msps ADCs |
| LTC2206CUK | 16-Bit, 105Msps/80Msps ADCs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC2207CUK | 制造商:Linear Technology 功能描述:ADC Single Pipelined 105Msps 16-bit Parallel 48-Pin QFN EP |
| LTC2207CUK#PBF | 制造商:Linear Technology 功能描述:ADC Single Pipelined 105Msps 16-bit Parallel 48-Pin QFN EP 制造商:Linear Technology 功能描述:IC ADC 16-BIT 105MSPS 48-QFN 制造商:Linear Technology 功能描述:IC ADC 16BIT 105MSPS QFN-48 制造商:Linear Technology 功能描述:ADC 16BIT 105MSPS 48QFN 制造商:Linear Technology 功能描述:IC, ADC, 16BIT, 105MSPS, QFN-48; Resolution (Bits):16bit; Sampling Rate:105MSPS; Supply Voltage Type:Single; Supply Voltage Min:3.135V; Supply Voltage Max:3.465V; Supply Current:273mA; Digital IC Case Style:QFN; No. of Pins:48 ;RoHS Compliant: Yes |
| LTC2207CUK#PBF | 制造商:Linear Technology 功能描述:IC, ADC, 16BIT, 105MSPS, QFN-48 |
| LTC2207CUK#TRPBF | 制造商:Linear Technology 功能描述:ADC Single Pipelined 105Msps 16-bit Parallel 48-Pin QFN EP T/R 制造商:Linear Technology 功能描述:IC ADC 16BIT 105MSPS 48-QFN |
| LTC2207CUK-14 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:14-Bit, 105Msps/80Msps ADCs |
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