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.
SPI and QSPI are registered trademarks of Motorola, Inc.
|Part number||Order||Resolution (Bits)||Sample rate (Max) (kSPS)||Number of input channels||Interface||Operating temperature range (C)||Package Group||Approx. price (US$)||Power consumption (Typ) (mW)||Package size: mm2:W x L (PKG)||Architecture||Input type||Multi-channel configuration||Reference mode||Features||Input range (Max) (V)||Input range (Min) (V)||Analog voltage AVDD (Min) (V)||Analog voltage AVDD (Max) (V)||Digital supply (Min) (V)||Digital supply (Max) (V)||INL (Max) (+/-LSB)||Rating|
||10||85||8||SPI||-40 to 125||SSOP | 20||3.32 | 1ku||1.05||20SSOP: 38 mm2: 5.3 x 7.2 (SSOP | 20)||SAR||Single-Ended||Multiplexed||Ext||
||10||85||8||SPI||-40 to 85||SSOP | 20||2.64 | 1ku||1.75||20SSOP: 38 mm2: 5.3 x 7.2 (SSOP | 20)||SAR||Single-Ended||Multiplexed||Ext||
||10||91||8||SPI||-40 to 125||SSOP | 20||3.35 | 1ku||0.95||20SSOP: 38 mm2: 5.3 x 7.2 (SSOP | 20)||SAR||Single-Ended||Multiplexed||Ext||5.5||0||2.7||5.5||2.7||5.5||1||HiRel Enhanced Product|