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參數(shù)資料
| 型號： | LTC1605-2CN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | Single Supply 16-Bit, 100ksps, Sampling ADCs |
| 中文描述： | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDIP28 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-28 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 490K |
| 代理商： | LTC1605-2CN |
8
LTC1605
APPLICATIO
S I
FOR
ATIO
U
Conversion Details
The LTC1605 uses a successive approximation algorithm
and an internal sample-and-hold circuit to convert an
analog signal to a 16-bit or two byte parallel output. The
ADC is complete with a precision reference and an internal
clock. The control logic provides easy interface to micro-
processors and DSPs. (Please refer to the Digital Interface
section for the data format.)
Conversion start is controlled by the CS and R/C inputs. At
the start of conversion the successive approximation
register (SAR) is reset. Once a conversion cycle has begun
it cannot be restarted.
During the conversion, the internal 16-bit capacitive DAC
output is sequenced by the SAR from the most significant
bit (MSB) to the least significant bit (LSB). Referring to
Figure 1, V
IN
is connected through the resistor divider to
the sample-and-hold capacitor during the acquire phase
and the comparator offset is nulled by the autozero switches.
In this acquire phase, a minimum delay of 2
μ
s will provide
enough time for the sample-and-hold capacitor to acquire
the analog signal. During the convert phase, the autozero
switches open, putting the comparator into the compare
mode. The input switch switches C
SAMPLE
to ground,
injecting the analog input charge onto the summing junc-
tion. This input charge is successively compared with the
binary-weighted charges supplied by the capacitive DAC.
Bit decisions are made by the high speed comparator. At
the end of a conversion, the DAC output balances the V
IN
input charge. The SAR contents (a 16-bit data word) that
represents the V
IN
are loaded into the 16-bit output latches.
W
U
U
Driving the Analog Inputs
The nominal input range for the LTC1605 is
±
10V or
(
±
4 V
REF
) and the input is overvoltage protected to
±
25V.
The input impedance is typically 20k
, therefore, it should
be driven with a low impedance source. Wideband noise
coupling into the input can be minimized by placing a
1000pF capacitor at the input as shown in Figure 2. An
NPO-type capacitor gives the lowest distortion. Place the
capacitor as close to the device input pin as possible. If an
amplifier is to be used to drive the input, care should be
taken to select an amplifier with adequate accuracy, linear-
ity and noise for the application. The following list is a
summary of the op amps that are suitable for driving the
LTC1605. More detailed information is available in the
Linear Technology data books and LinearView
TM
CD-ROM.
Figure 1. LTC1605 Simplified Equivalent Circuit
V
DAC
1605 F01
+
–
C
DAC
DAC
SAMPLE
HOLD
C
SAMPLE
S
A
R
16-BIT
LATCH
COMPARATOR
SAMPLE
SI
R
IN2
R
IN1
V
IN
1605 F02
1000pF
33.2k
V
IN
CAP
A
IN
200
Figure 2. Analog Input Filtering
LT1007 - Low noise precision amplifier. 2.7mA supply
current
±
5V to
±
15V supplies. Gain bandwidth product
8MHz. DC applications.
LT1097 - Low cost, low power precision amplifier. 300
μ
A
supply current.
±
5V to
±
15V supplies. Gain bandwidth
product 0.7MHz. DC applications.
LT1227 - 140MHz video current feedback amplifier. 10mA
supply current.
±
5V to
±
15V supplies. Low noise and low
distortion.
LT1360 - 37MHz voltage feedback amplifier. 3.8mA sup-
ply current.
±
5V to
±
15V supplies. Good AC/DC specs.
LT1363 - 50MHz voltage feedback amplifier. 6.3mA sup-
ply current. Good AC/DC specs.
LT1364/LT1365 - Dual and quad 50MHz voltage feedback
amplifiers. 6.3mA supply current per amplifier. Good AC/
DC specs.
LinearView is a trademark of Linear Technology Corporation
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1605-2I | Single Supply 16-Bit, 100ksps, Sampling ADCs |
| LTC1605-2IG | Single Supply 16-Bit, 100ksps, Sampling ADCs |
| LTC1605-2IN | Single Supply 16-Bit, 100ksps, Sampling ADCs |
| LTC1605ACG | 16-Bit, 100ksps, Sampling ADC |
| LTC1605ACN | 16-Bit, 100ksps, Sampling ADC |
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