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ADS5527 Datasheet(PDF) 11 Page - Texas Instruments

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Part # ADS5527
Description  11-BIT, 200 MSPS ADC
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

ADS5527 Datasheet(HTML) 11 Page - Texas Instruments

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DEVICE PROGRAMMING MODES
USING PARALLEL INTERFACE CONTROL ONLY
USING SERIAL INTERFACE PROGRAMMING ONLY
USING BOTH THE SERIAL INTERFACE AND PARALLEL CONTROLS
ADS5517
SLWS203 – DECEMBER 2007
ADS5517 offers flexibility with several programmable features that are easily configured.
The device can be configured independently using either parallel interface control or serial interface
programming.
In addition, the device supports a third configuration mode, where both the parallel interface and the serial control
registers are used. In this mode, the priority between the parallel and serial interfaces is determined by a priority
table (Table 2). If this additional level of flexibility is not required, the user can select either the serial interface
programming or the parallel interface control.
To control the device using parallel interface, keep RESET tied to high (DRVDD). Pins DFS, MODE, SEN,
SCLK, and SDATA are used to directly control certain modes of the ADC. The device is configured by
connecting the parallel pins to the correct voltage levels (as described in Table 3 to Table 7). There is no need to
apply reset.
In this mode, SEN, SCLK, and SDATA function as parallel interface control pins. Frequently used functions are
controlled in this mode—standby, selection between LVDS/CMOS output format, internal/external reference,
two's complement/straight binary output format, and position of the output clock edge.
Table 1 has a description of the modes controlled by the parallel pins.
Table 1. Parallel Pin Definition
PIN
CONTROL MODES
DFS
DATA FORMAT and the LVDS/CMOS output interface
MODE
Internal or external reference
SEN
CLKOUT edge programmability
SCLK
LOW SPEED mode control for low sampling frequencies (< 50 MSPS)
SDATA
STANDBY mode – Global (ADC, internal references and output buffers are powered down)
To program using the serial interface, the internal registers must first be reset to their default values, and the
RESET pin must be kept low. In this mode, SEN, SDATA, and SCLK function as serial interface pins and are
used to access the internal registers of ADC. The registers are reset either by applying a pulse on the RESET
pin, or by a high setting on the <RST> bit (D1 in register 0x6C). The serial interface section describes the
register programming and register reset in more detail.
Since the parallel pins DFS and MODE are not used in this mode, they must be tied to ground.
For increased flexibility, a combination of serial interface registers and parallel pin controls (DFS, MODE) can
also be used to configure the device.
The serial registers must first be reset to their default values and the RESET pin must be kept low. In this mode,
SEN, SDATA, and SCLK function as serial interface pins and are used to access the internal registers of ADC.
The registers are reset either by applying a pulse on RESET pin or by a high setting on the <RST> bit (D1 in
register 0x6C). The serial interface section describes the register programming and register reset in more detail.
The parallel interface control pins DFS and MODE are used and their function is determined by the appropriate
voltage levels as described in Table 6 and Table 7. The voltage levels are derived by using a resistor string as
illustrated in Figure 4. Since some functions are controlled using both the parallel pins and serial registers, the
priority between the two is determined by a priority table (Table 2).
Copyright © 2007, Texas Instruments Incorporated
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