Datasheet LTC1748 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 14-Bit, 80Msps Low Noise ADC |
| Pages / Page | 20 / 1 — FEATURES. DESCRIPTIO. Sample Rate: 80Msps. 76.3dB SNR and 90dB SFDR (3.2V … |
| File Format / Size | PDF / 541 Kb |
| Document Language | English |
FEATURES. DESCRIPTIO. Sample Rate: 80Msps. 76.3dB SNR and 90dB SFDR (3.2V Range). 72.6dB SNR and 90dB SFDR (2V Range)
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Text Version of Document
LTC1748 14-Bit, 80Msps Low Noise ADC
U FEATURES DESCRIPTIO
■
Sample Rate: 80Msps
The LTC®1748 is an 80Msps, sampling 14-bit A/D con- ■
76.3dB SNR and 90dB SFDR (3.2V Range)
verter designed for digitizing high frequency, wide dy- ■
72.6dB SNR and 90dB SFDR (2V Range)
namic range signals. Pin selectable input ranges of ±1V ■ No Missing Codes and ±1.6V along with a resistor programmable mode ■ Single 5V Supply allow the LTC1748’s input range to be optimized for a wide ■ Power Dissipation: 1.4W variety of applications. ■ Selectable Input Ranges: ±1V or ±1.6V The LTC1748 is perfect for demanding communications ■ 240MHz Full Power Bandwidth S/H applications with AC performance that includes 76.3dB ■ Pin Compatible Family SNR and 90dB spurious free dynamic range. Ultralow jitter 25Msps: LTC1746 (14-Bit), LTC1745 (12-Bit) of 0.15ps 50Msps: LTC1744 (14-Bit), LTC1743 (12-Bit) RMS allows undersampling of IF frequencies with excellent noise performance. DC specs include ±3LSB INL 65Msps: LTC1742 (14-Bit), LTC1741 (12-Bit) and no missing codes. 80Msps: LTC1748 (14-Bit), LTC1747 (12-Bit) ■ 48-Pin TSSOP Package The digital interface is compatible with 5V, 3V, 2V and LVDS logic systems. The ENC and ENC inputs may be
U
driven differentially from PECL, GTL and other low swing
APPLICATIO S
logic families or from single-ended TTL or CMOS. The low noise, high gain ENC and ENC inputs may also be driven ■ Telecommunications by a sinusoidal signal without degrading performance. A ■ Receivers separate output power supply can be operated from 0.5V ■ Cellular Base Stations to 5V, making it easy to connect directly to any low voltage ■ Spectrum Analysis DSPs or FIFOs. ■ Imaging Systems , LTC and LT are registered trademarks of Linear Technology Corporation. The TSSOP package with a flow-through pinout simplifies the board layout.
W BLOCK DIAGRA 80Msps, 14-Bit ADC with a 2V Differential Input Range
OVDD 0.5V TO 5V 0.1µF 0.1µF A + IN OF ±1V CORRECTION 14 D13 DIFFERENTIAL S/H 14-BIT LOGIC AND OUTPUT • • ANALOG INPUT AMP PIPELINED ADC SHIFT LATCHES • A – D0 IN REGISTER CLKOUT OGND SENSE BUFFER VDD 5V RANGE 1µF 1µF SELECT DIFF AMP 1µF VCM GND 2.35VREF CONTROL LOGIC 4.7µF 1748 BD REFLB REFHA REFLA REFHB ENC ENC MSBINV OE 4.7µF 0.1µF 0.1µF DIFFERENTIAL 1µF 1µF ENCODE INPUT 1748fa 1
U FEATURES DESCRIPTIO
■
Sample Rate: 80Msps
The LTC®1748 is an 80Msps, sampling 14-bit A/D con- ■
76.3dB SNR and 90dB SFDR (3.2V Range)
verter designed for digitizing high frequency, wide dy- ■
72.6dB SNR and 90dB SFDR (2V Range)
namic range signals. Pin selectable input ranges of ±1V ■ No Missing Codes and ±1.6V along with a resistor programmable mode ■ Single 5V Supply allow the LTC1748’s input range to be optimized for a wide ■ Power Dissipation: 1.4W variety of applications. ■ Selectable Input Ranges: ±1V or ±1.6V The LTC1748 is perfect for demanding communications ■ 240MHz Full Power Bandwidth S/H applications with AC performance that includes 76.3dB ■ Pin Compatible Family SNR and 90dB spurious free dynamic range. Ultralow jitter 25Msps: LTC1746 (14-Bit), LTC1745 (12-Bit) of 0.15ps 50Msps: LTC1744 (14-Bit), LTC1743 (12-Bit) RMS allows undersampling of IF frequencies with excellent noise performance. DC specs include ±3LSB INL 65Msps: LTC1742 (14-Bit), LTC1741 (12-Bit) and no missing codes. 80Msps: LTC1748 (14-Bit), LTC1747 (12-Bit) ■ 48-Pin TSSOP Package The digital interface is compatible with 5V, 3V, 2V and LVDS logic systems. The ENC and ENC inputs may be
U
driven differentially from PECL, GTL and other low swing
APPLICATIO S
logic families or from single-ended TTL or CMOS. The low noise, high gain ENC and ENC inputs may also be driven ■ Telecommunications by a sinusoidal signal without degrading performance. A ■ Receivers separate output power supply can be operated from 0.5V ■ Cellular Base Stations to 5V, making it easy to connect directly to any low voltage ■ Spectrum Analysis DSPs or FIFOs. ■ Imaging Systems , LTC and LT are registered trademarks of Linear Technology Corporation. The TSSOP package with a flow-through pinout simplifies the board layout.
W BLOCK DIAGRA 80Msps, 14-Bit ADC with a 2V Differential Input Range
OVDD 0.5V TO 5V 0.1µF 0.1µF A + IN OF ±1V CORRECTION 14 D13 DIFFERENTIAL S/H 14-BIT LOGIC AND OUTPUT • • ANALOG INPUT AMP PIPELINED ADC SHIFT LATCHES • A – D0 IN REGISTER CLKOUT OGND SENSE BUFFER VDD 5V RANGE 1µF 1µF SELECT DIFF AMP 1µF VCM GND 2.35VREF CONTROL LOGIC 4.7µF 1748 BD REFLB REFHA REFLA REFHB ENC ENC MSBINV OE 4.7µF 0.1µF 0.1µF DIFFERENTIAL 1µF 1µF ENCODE INPUT 1748fa 1
