Datasheet AD6645 (Analog Devices)

14-Bit, 80 MSPS/105 MSPS A/D Converter Data Sheet AD6645 FEATURES
provides CMOS-compatible digital outputs. It is the fourth
SNR = 75 dB, f
generation in a wideband ADC family, preceded by the AD9042
IN 15 MHz, up to 105 MSPS SNR = 72 dB, f
(12-bit, 41 MSPS), the AD6640 (12-bit, 65 MSPS, IF sampling),
IN 200 MHz, up to 105 MSPS SFDR = 89 dBc, f
and the AD6644 (14-bit, 40 MSPS/65 MSPS).
IN 70 MHz, up to 105 MSPS 100 dBFS multitone SFDR
Designed for multichannel, multimode receivers, the AD6645 is
IF sampling to 200 MHz
part of the Analog Devices, Inc., SoftCel ® transceiver chipset.
Sampling jitter: 0.1 ps
The AD6645 maintains 100 dB multitone, spurious-free dynamic
1.5 W power dissipation
range (SFDR) through the second Nyquist band. This breakthrough
Differential analog inputs
performance eases the burden placed on multimode digital
Pin compatible to AD6644
receivers (software radios) that are typical y limited by the ADC.
Twos complement digital output format
Noise performance is exceptional; typical signal-to-noise ratio
3.3 V CMOS compatible
(SNR) is 74.5 dB through the first Nyquist band.
Data-ready for output latching
The AD6645 is built on the Analog Devices extra fast
APPLICATIONS
complementary bipolar (XFCB) process and uses an innovative, multipass circuit architecture. Units are available in a 52-lead
Multichannel, multimode receivers
exposed pad (TQFP_EP) package specified from −40°C to
Base station infrastructures
+85°C at 80 MSPS and −10°C to +85°C at 105 MSPS.
AMPS, IS-136, CDMA, GSM, W-CDMA Single channel digital receivers PRODUCT HIGHLIGHTS Antenna array processing
1. IF Sampling. The AD6645 maintains outstanding ac
Communications instrumentation
performance up to input frequencies of 200 MHz, suitable
Radars, infrared imaging
for multicarrier 3G wideband cel ular IF sampling receivers.
Instrumentation
2. Pin Compatibility. The ADC has the same footprint and
GENERAL DESCRIPTION
pin layout as the AD6644 14-bit, 40 MSPS/65 MSPS ADC. 3. SFDR Performance and Oversampling. Multitone SFDR The AD6645 is a high speed, high performance, monolithic 14-bit performance of 100 dBFS can reduce the requirements of analog-to-digital converter (ADC). All necessary functions, high end RF components. including track-and-hold (T/H) and reference, are included on the chip to provide a complete conversion solution. The AD6645
FUNCTIONAL BLOCK DIAGRAM AVCC DVCC AD6645 AIN A1 TH1 TH2 A2 TH3 TH4 TH5 ADC3 AIN ADC1 DAC1 ADC2 DAC2 6 VREF 2.4V 5 5 ENCODE INTERNAL DIGITAL ERROR CORRECTION LOGIC ENCODE TIMING GND DMID OVR DRY D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
001
MSB LSB
02647- Figure 1.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION PRODUCT HIGHLIGHTS FUNCTIONAL BLOCK DIAGRAM REVISION HISTORY SPECIFICATIONS DC SPECIFICATIONS DIGITAL SPECIFICATIONS AC SPECIFICATIONS SWITCHING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE EXPLANATION OF TEST LEVELS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS EQUIVALENT CIRCUITS TERMINOLOGY THEORY OF OPERATION APPLYING THE AD6645 Encoding the AD6645 Driving the Analog Inputs Power Supplies Digital Outputs Grounding LAYOUT INFORMATION JITTER CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE