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參數(shù)資料
| 型號： | 5962-0720701VXC |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 1-CH 13-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP84 |
| 封裝： | CERAMIC, QFP-84 |
| 文件頁數(shù)： | 7/22頁 |
| 文件大?。?/td> | 706K |
| 代理商： | 5962-0720701VXC |
www.ti.com
APPLICATION INFORMATION
Theory of Operation
Input Configuration
ADT1-1WT
1 : 1
AIN
ADS5444
AC Signal
Source
R0
50 W
Z0
50 W
R
50 W
RT
100
+
OPA695
5 V
R1
400
ADS5444
CIN
RIN
0.1
F
1:1
5 V
R2
57.5
VIN
AV = 8V/V
(18 dB)
RS
100
1000
F
RIN
AIN
ADS5444-SP
SGLS391 – MARCH 2008
The ADS5444 is a 13 bit, 250 MSPS, monolithic pipeline analog-to-digital converter (ADC). Its bipolar analog
core operates from a 5 V supply, while the output uses a 3.3 V supply to provide LVDS compatible outputs. The
conversion process is initiated by the rising edge of the external input clock. At that instant, the differential input
signal is captured by the input track and hold (T&H) and the input sample is sequentially converted by a series of
small resolution stages, with the outputs combined in a digital correction logic block. Both the rising and the
falling clock edges are used to propagate the sample through the pipeline every half clock cycle. This process
results in a data latency of four clock cycles, after which the output data is available as a 13 bit parallel word,
coded in offset binary format.
The analog input for the ADS5444 consists of an analog differential buffer followed by a bipolar T&H. The analog
buffer isolates the source driving the input of the ADC from any internal switching. The input common mode is
set internally through a 500
resistor connected from 2.4 V to each of the inputs. This results in a differential
input impedance of 1 k
.
For a full-scale differential input, each of the differential lines of the input signal (pins 17 and 18) swings
symmetrically between 2.4 + 0.55 V and 2.4 – 0.55 V. This means that each input has a maximum signal swing
of 1.1 VPP for a total differential input signal swing of 2.2 VPP. The maximum swing is determined by the internal
reference voltage generator eliminating the need for any external circuitry for this purpose.
The ADS5444 obtains optimum performance when the analog inputs are driven differentially. The circuit in
Figure 13 shows one possible configuration using an RF transformer with termination either on the primary or on
the secondary of the transformer. If voltage gain is required, a step up transformer can be used. For voltage
gains that would require an impractical transformer turn ratio, a single-ended amplifier driving the transformer is
shown in Figure 14.
Figure 13. Converting a Single-Ended Input to a Differential Signal Using RF Transformers
Figure 14. Using the OPA695 with the ADS5444
Copyright 2008, Texas Instruments Incorporated
15
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