| Resolution (Bits) | 10 |
| Number of input channels | 8 |
| Sample rate (Max) (kSPS) | 85 |
| Interface type | SPI |
| Architecture | SAR |
| Input type | Single-Ended |
| Multi-channel configuration | Multiplexed |
| Rating | Automotive |
| Reference mode | Ext |
| Input range (Max) (V) | 5.5 |
| Input range (Min) (V) | 0 |
| Operating temperature range (C) | -40 to 125 |
| Power consumption (Typ) (mW) | 1.05 |
| Analog voltage AVDD (Min) (V) | 2.7 |
| Analog voltage AVDD (Max) (V) | 5.5 |
| INL (Max) (+/-LSB) | 1 |
| Digital supply (Min) (V) | 2.7 |
| Digital supply (Max) (V) | 5.5 |
- Qualified for Automotive Applications
- ESD Protection Exceeds 2000 V Per MIL-STD-883, Method 3015; Exceeds 200 V Using Machine Model (C = 200 pF, R = 0)
- 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
SPI and QSPI are registered trademarks of Motorola, Inc.
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 over the full automotive temperature range of ?40°C to 125°C.
