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Mixed Signal Systems A/D Converter Lineup CXA3256R

Mixed Signal Systems A/D Converter Lineup  CXA3256R
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Mixed Signal Systems A/D Converter Lineup CXA3256R

Product catalog summary
Overview: The CXA3256R is an 8-bit high-speed flash A/D converter designed for digitizing analog signals at a maximum rate of 120MSPS. It supports ECL, PECL, or TTL digital input levels and offers a 1:2 demultiplexed output with TTL digital output levels. The device is an enhancement of the CXA3246Q, featuring an ultra-small package.
Key Features:
  • Differential and integral linearity error: ±0.5LSB or less
  • High-speed operation up to 120MSPS
  • Low input capacitance of 10pF
  • Wide analog input bandwidth of 250MHz
  • Low power consumption at 500mW
  • Power saving function and 1:2 demultiplexed output
  • Compatible with ECL, PECL, and TTL digital input levels
  • Single +5V power supply operation
  • Ultra-small 48-pin LQFP package
Applications: The CXA3256R is suitable for magnetic recording (PRML), communications (QPSK, QAM), LCDs, and digital oscilloscopes.
Specifications:
  • Supply voltage: +4.75 to +5.25V
  • Analog input voltage: VRB to VRT
  • Reference input voltage: VRT 2.9 to 4.1V, VRB 1.4 to 2.6V
  • Maximum conversion rate: 120MSPS in DMUX mode
  • Operating temperature: -20 to +75°C
Pin Configuration: The device includes various pins for digital power supply, analog ground, reference voltage, clock inputs, data output switching, and more, with specific voltage levels for each.
Electrical Characteristics: The device features a resolution of 8 bits, with specific DC characteristics such as integral and differential linearity errors, input capacitance, and resistance. It also includes dynamic characteristics like input bandwidth and SNR.
Operation Modes: The CXA3256R supports two operation modes, selectable via the SELECT1 pin. In DMUX mode, the clock frequency is divided by 2, and data is output demultiplexed by this clock. The device includes a reset function for the 1/2 frequency-divided clocks.
Specifications and Operation Modes: The document discusses the CXA3256R, an A/D converter capable of operating in two modes: DMUX and Straight. In DMUX mode, the converter operates at a minimum frequency of 120MSPS, while in Straight mode, it operates at 100MSPS. The reset signal timing is crucial for initiating the 1/2 frequency-divided clock, and the setup time (T_rs) is necessary.
Operation Mode Table: The table outlines the operation modes, maximum conversion rates, and data output configurations. In DMUX mode, the output is demultiplexed at 60Mbps, while in Straight mode, it is straight at 100Mbps.
Digital Input Levels and Supply Voltage Settings: The CXA3256R supports ECL, PECL, and TTL logic levels. The power supplies must match the logic input levels for stable operation.
Application Circuits: Various application circuits are provided for different input types (ECL, PECL, TTL) and modes (DMUX, Straight). These circuits illustrate typical configurations for using the CXA3256R.
Notes on Operation: Key operational notes include recommendations for matching input signal impedance, power supply and grounding considerations, and the importance of short digital output wiring to prevent performance degradation.
Representative Characteristics: Graphs and charts provide insights into current consumption, error rates, and signal-to-noise ratio (SNR) across different conditions and configurations.
Package Outline: The CXA3256R is housed in a 48-pin LQFP package, with specific dimensions and material details provided.
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Catalog excerpts

Mixed Signal Systems A/D Converter Lineup  CXA3256R-5

CXA3256R Pin Description and I/O Pin Equivalent Circuit PinNo.SymbolI/O Standardvoltage level Equivalent circuitDescription 3, 105, 820, 2932, 4119, 3031, 4212 1 AGNDAV Analog ground.Separated from the digital ground.Analog power supply.Separated from the digital power supply.Digital ground.Digital power supply.Digital power supply.Ground for ECL input. +5V for PECL and TTL inputs. Digital power supply.5V for ECL input. Ground for PECL and TTL inputs.Data output switching.Data is output from both the PA side and PB side by setting this pin open. When set to DVcc1 level, only the PA side output...

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Mixed Signal Systems A/D Converter Lineup  CXA3256R-11

EE OSC1 φ : Variable AV > CC 4V1.95V2V 5V5VIccI V > RT DV > CC 1DV > IN 8fr1024samples > CC 2PSDGND3DGND2DGND1 AGNDCLK/EDV CXA3256R LogicAnalizer V > IN 5MHz PECL OSC2 V > RB EE 3 100MHz 100MHzAmp ECLBufferCLKV > +V VS2S1S1: ON when A < BS2: ON when A > B V > RT V > IN V > RM 2V > RB CLKV ֢Ȇυ∆ 129128 127126125Sampling timing fluctuation(= aperture jitter) t A < B A > BComparatorA8toA1A0B8toB1B0 > IN σ (LSB) > IN 8 8 CXA3256R Buffer CLK 1Ӕ0Ӕ000׷00to111׷׷10V DVM Where σ (LSB) is the deviation of the output codes whenthe largest slew rate point is sampled at the clock which has exactly the same...

 Open the catalog to page 11
Mixed Signal Systems A/D Converter Lineup  CXA3256R-17

Tds N 2 1.4ns (typ.) > IN N֖ 1 N + 3N + 1N + 4N +5 T NN + 6 CLKV Tpw1N + 2 Tpw0 3.5ns (min)7.5ns (max) 7.0ns (max) 2.0V0.8V N + 2 PBD0 to D7PAD0 to D7N 2.0V0.8VTdo1 N + 1 N + 3 Td_clk; 4.5ns (typ.) T + 0.5ns (typ.) ≈ T ≈ T 3.0ns (min) (Pin 6)(Pin 13) (Pins 21 to 28)(Pins 33 to 40) (Pin 43)(Pin 48) CLK OUTRESETN 2.0V 2.0V (Reset period) 0.8V Tdo2; 5.0ns (typ.) 0.8V 2.0V 0.8V T_rh T_rs T_rh T_rs >

 Open the catalog to page 17
Mixed Signal Systems A/D Converter Lineup  CXA3256R-19

CXA3256R Notes on Operation? The CXA3256R has the PECL and TTL input pins for the clock and reset input pins. When the clock is inputin PECL level, inputting the reset signal in PECL level is recommended. Also, when the clock is input in TTL level, inputting the reset signal in TTL is recommended. ? The impedance of the input signal should be properly matched to ensure the CXA3256R's stable operation atthe high speed. ? In the CXA3256R, all the TTL input pins become the high level when left open. ? The power supply and grounding have a profound influence on converter performance. The power supplyand...

 Open the catalog to page 19
Mixed Signal Systems A/D Converter Lineup  CXA3256R-20

CXA3256R ? When the digital input level is ECL or PECL level, ∗∗∗ /E pins should be used and ∗∗∗ /T pins left open. Whenthe digital input level is TTL, ∗∗∗ /T pins should be used and ∗∗∗ /E pins left open. ? ? The CXA3256R TTL output high level is clamped to approximately 2.8 V in the IC.This makes it possible todirectly interface with the 3.3V system CMOS IC. However,the CXA3256R has the VOCLP pin which is used to clamp the TTL output high level. See the Example of Representative Characteristics for the relationship between the VOCLP pin and the TTL high level. The CXA3026Q has the output pins...

 Open the catalog to page 20
Mixed Signal Systems A/D Converter Lineup  CXA3256R-21

fin = 1kHz f > CLK 4 DMUX modeC > L = 5pF 95100 105110 95100 105110 120 > Current consumption [mA] Current consumption [mA] Ta֖ Ambient temperature [C]Ж25902575 Fc Conversion rate [MSPS]09060 > RT = 4VV > RB = 2V 34V 50100 0 > Reference current [mA] Analog input current [ֵA] Analog input voltage [V]234 Ta Ambient temperature [ְC]2522575 >

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Mixed Signal Systems A/D Converter Lineup  CXA3256R-22

6 CLK 10 > ֖7 4 Error > 16LSBfin = 1kHzf 10 > ֖8 SNR [dB] 304050 30310 Fc = 120MSPS > Error Rate [TPS] 10 > 9 10 > ֖10 120140160 10 Input frequency [MHz]120550 Fc Conversion rate [MSPS] > fin =֖ 1kHz f > CLK 4 Error > 16LSB Error rate: 10 > 9 TPS TTL high level whenVOCLP is open. 150170 23 140 160 > TTL output high level [V] Fc֖ Maximum conversion rate [MSPS] 1 Ta Ambient temperature [ְC]251302575 VOCLP pin voltage [V]0.5135 >

 Open the catalog to page 22
Mixed Signal Systems A/D Converter Lineup  CXA3256R-23

PACKAGE MATERIALLEAD TREATMENTLEAD MATERIALPACKAGE MASSEPOXY RESINCOPPER ALLOY SONY CODEEIAJ CODEJEDEC CODE PALLADIUM PLATING 0.2gLQFP-48P-L01P-LQFP48-7x7-0.5

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