1FEATURES

• Maximum Throughput 200-KSPS

• Built-In Reference, Conversion Clock and

8x FIFO

• Differential/Integral Nonlinearity Error: ±1.2

LSB

• Signal-to-Noise and Distortion Ratio: 70 dB,

f i = 12 kHz

• Spurious Free Dynamic Range: 75 dB,

f i = 12 kHz

• SPI (CPOL = 0, CPHA = 0)/DSP-Compatible

Serial Interfaces With SCLK up to 20 MHz

• Single Wide Range Supply 3.0 Vdc to 5.5 Vdc

• Analog Input Range 0 V to Supply Voltage

With 500-kHz BW

• Hardware Controlled and Programmable

Sampling Period

• Low Operating Current (1.0 mA at 3.3 V,

2.0 mA at 5.5 V With External Ref, 1.7-mA at

3.3V, 2.4-mA at 5.5-V With Internal Ref)

• Power Down: Software/Hardware

Power-Down Mode (1 μA Max, Ext Ref),

Autopower-Down Mode (1 μA, Ext Ref)

• Programmable Auto-Channel Sweep

SUPPORTS DEFENSE, AEROSPACE,

AND MEDICAL APPLICATIONS

• Controlled Baseline

• One Assembly/Test Site

• One Fabrication Site

• Available in Military (–55°C/125°C)

Temperature Range(1)

• Extended Product Life Cycle

• Extended Product-Change Notification

• Product Traceability

DESCRIPTION

The TLV2548 is a high performance, 12-bit low-power, 3.86-μs, CMOS analog-to-digital converter (ADC) which

operates from a single 3.0-V to 5.5-V power supply. This device has three digital inputs and a 3-state output [chip

select (CS), serial input-output clock (SCLK), serial data input (SDI), and serial data output (SDO)] that provide a

direct 4-wire interface to the serial port of most popular host microprocessors (SPI interface). When interfaced

with a TI DSP, a frame sync (FS) signal is used to indicate the start of a serial data frame.

In addition to a high-speed A/D converter and versatile control capability, this device has an on-chip analog

multiplexer that can select any analog inputs or one of three internal self-test voltages. The sample-and-hold

function is automatically started after the fourth SCLK edge (normal sampling) or can be controlled by a special

pin, CSTART, to extend the sampling period (extended sampling). The normal sampling period can also be

programmed as short (12 SCLKs) or as long (24 SCLKs) to accommodate faster SCLK operation popular among

high-performance signal processors. The TLV2548 is designed to operate with very low power consumption. The

power-saving feature is further enhanced with software/hardware/autopower-down modes and programmable

conversion speeds. The conversion clock (OSC) and reference are built-in. The converter can use the external

SCLK as the source of the conversion clock to achieve higher (up to 2.8 μs when a 20-MHz SCLK is used)

conversion speed. Two different internal reference voltages are available. An optional external reference can also

be used to achieve maximum flexibility.

The TLV2548 is characterized for operation from –55°C to 125°C.