Controlled Baseline
− One Assembly Site, One Test Site, One
Fabrication Site
Extended Temperature Performance of
−40°C to 125°C
Enhanced Diminishing Manufacturing
Sources (DMS) Support
Enhanced Product-Change Notification
Qualification Pedigree†
Conversion Time ≤ 10 μs
10-Bit-Resolution ADC
Programmable Power-Down
Mode . . . 1 μA
Wide Range Single-Supply Operation of
2.7 V dc to 5.5 V dc
Analog Input Range of 0 V to VCC
Built-in Analog Multiplexer with 8 Analog
Input Channels
TMS320 DSP and Microprocessor SPI and
QSPI Compatible Serial Interfaces
End-of-Conversion (EOC) Flag
Inherent Sample-and-Hold Function
Built-In Self-Test Modes
Programmable Power and Conversion Rate
Asynchronous Start of Conversion for
Extended Sampling
Hardware I/O Clock Phase Adjust Input

description
The TLV1548 is a CMOS 10-bit switched-capacitor successive-approximation (SAR) analog-to-digital (A/D)
converter. The device has a chip select (CS), input-output clock (I/O CLK), data input (DATA IN) and serial data
output (DATA OUT) that provides a direct 4-wire synchronous serial peripheral interface (SPI, QSPI) port
of a host microprocessor. When interfacing with a TMS320 DSP, an additional frame sync signal (FS) indicates
the start of a serial data frame. The device allows high-speed data transfers from the host. The INV CLK input
provides further timing flexibility for the serial interface.
In addition to a high-speed converter and versatile control capability, the device has an on-chip 11-channel
multiplexer that can select any one of eight analog inputs or any one of three internal self-test voltages. The
sample-and-hold function is automatic except for the extended sampling cycle, where the sampling cycle is
started by the falling edge of asynchronous CSTART. At the end of the A/D conversion, the end-of-conversion
(EOC) output goes high to indicate that the conversion is complete. The TLV1548 is designed to operate with
a wide range of supply voltages with very low power consumption. The power saving feature is further enhanced
with a software-programmed power-down mode and conversion rate. The converter incorporated in the device
features differential high-impedance reference inputs that facilitate ratiometric conversion, scaling, and
isolation of analog circuitry from logic and supply noise. A switched-capacitor design allows low-error
conversion over the full operating temperature range.
The TLV1548 has eight analog input channels. The TLV1548Q is characterized for operation from −40°C to
125°C.