ADS1601IPFBR datasheet(22/31 Pages) TI2

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FSO

ADS1601

SCLK

DOUT

SYNC

FSR

TMS320

CLKR

FSX

ADS1601

SBAS322D

– DECEMBER 2004 – REVISED OCTOBER 2011

www.ti.com

LAYOUT ISSUES AND COMPONENT

The McBSP provides a host of functions including:

SELECTION

•

Full-duplex communication

•

Double-buffered data registers

The ADS1601 is a very high-speed, high-resolution

data

converter.

order

achieve

maximum

•

Independent framing and clocking for reception

performance,

the

user

must

give

very

careful

and transmission of data

consideration to both the layout of the printed circuit

The sequence begins with a one-time synchronization

board (PCB) in addition to the routing of the traces.

of the serial port by the microprocessor. The

Capacitors that are critical to achieve the best

ADS1601 recognizes the SYNC signal if it is high for

performance from the device should be placed as

at least one CLK period. Transfers are initiated by the

close to the pins of the device as possible. These

ADS1601 after the SYNC signal is de-asserted by the

include capacitors related to the analog inputs, the

microprocessor.

reference, and the power supplies.

The FSO signal from the ADS1601 indicates that

For critical capacitors, it is recommended that Class II

data is available to be read, and is connected to the

dielectrics such as Z5U be avoided. These dielectrics

frame sync receive (FSR) pin of the DSP. The clock

have

narrow

operating

temperature,

large

receiver (CLKR) is derived directly from the ADS1601

tolerance on the capacitance, and lose up to 20% of

serial

clock

output

ensure

continued

the rated capacitance over 10,000 hours. Rather,

synchronization of data with the clock.

select capacitors with a Class I dielectric. C0G (also

known as NP0), for example, has a tight tolerance

less than

±30ppm/°C and is very stable over time.

Should Class II capacitors be chosen because of the

size constraints, select an X7R or X5R dielectric to

minimize the variations of the capacitor

’s critical

characteristics.

The resistors used in the circuits to drive the input

and reference should be kept as low as possible to

prevent excess thermal noise from degrading the

system performance.

The digital outputs from the device should always be

buffered. This will have a number of benefits: it

Figure 51. ADS1601

—TMS320 Interface

reduces the loading of the internal digital buffers,

Connection

which decreases noise generated within the device,

and it also reduces device power consumption.

An evaluation module (EVM) is available from Texas

Instruments. The module consists of the ADS1601

APPLICATIONS INFORMATION

and supporting circuits, allowing users to quickly

assess the performance and characteristics of the

Interfacing the ADS1601 to the TMS320 DSP

ADS1601. The EVM easily connects to various

family.

microcontrollers and DSP systems. For more details,

Since the ADS1601 communicates with the host via a

or to download a copy of the ADS1601EVM User

’s

serial interface, the most suitable method to connect

Guide, visit the Texas Instruments web site at

to any of the TMS320 DSPs is via the multi-channel

www.ti.com.

buffered serial port (McBSP). A typical connection to

the TMS320 DSP is shown in Figure 51.

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