12-bit 140 MSPS IQ DAC

Overview

The 12-bit 140 MSPS IQ DAC employs a high-performance current steering architecture and provides optional differential current output or differential voltage output. The bandgap and current source are included to provide a complete DAC. The DAC can be configured to adjust full-scale output range. The DAC uses segmentation architecture combined with Q2 random walk algorithm to achieve excellent dynamic and static performance, wide output bandwidth. An internal resistive load together with current source is used to set differential voltage output, which independent from process, supply and temperature. LVDS transmitter, output buffers and IO PADs are included.
The block is designed on TSMC CMOS 65 nm technology.

Key Features

TSMC CMOS 65 nm
Resolution 12 bit
Current-sinking DAC
Different power supplies for digital (1.2 V) and analog parts (2.5 V)
Sampling rate up to 140 MSPS
Optional internal differential resistive load
Adjustable full-scale output range
Dynamic performance:

SFDR= 70 dB, NSD= 144.6 dBm/Hz for Fclk = 140 MHz and Fin= 5 MHz
SFDR= 61.6 dB, NSD= 143.9 dBm/Hz for Fclk = 140 MHz and Fin= 30 MHz

Differential nonlinearity 0.18 LSB
Integral nonlinearity 0.5 LSB
Compact die area 0.66 mm2
Supported foundries: TSMC, UMC, Global Foundries, SMIC

Applications

Wireless infrastructures
Broadband communications
Test equipment
Functional control systems

Deliverables

Schematic or NetList
Abstract view (.lef and .lib files)
Layout (optional)
Verilog behavior model
Extracted view (optional)
GDSII
DRC, LVS, antenna report
Test bench with saved configurations (optional)
Documentation

Technical Specifications

Foundry, Node

TSMC CMOS 65 nm

Maturity

Silicon proven

Availability

Now

TSMC

Silicon Proven: 65nm G

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