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PDF AT84AS008-EB Data sheet ( Hoja de datos )
| Número de pieza | AT84AS008-EB | |
| Descripción | 10-Bit Gsps ADC Evaluation Board | |
| Fabricantes | E2V | |
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10-bit 2.2 Gsps ADC Evaluation
Board - AT84AS008-EB
..............................................................................................
User Guide
1 page  
Section 1
Overview
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1.1 Description
The AT84AS008-EB Evaluation Board is a prototype board which has been designed to
facilitate the evaluation and characterization of the AT84AS008 device (in CBGA152) up
to its 3.3 GHz full power bandwidth at up to 2.2 Gsps in the extended temperature
range.
The high speed of the AT84AS008 requires that careful attention be paid to the circuit
design and layout so as to achieve the optimal performance. This six metal layer board
with an internal ground plane offers functions that enable a quick and simple evaluation
of the AT84AS008 ADC’s performances over the temperature range.
The AT84AS008 Evaluation Board (EB) is very straightforward as it only implements the
AT84AS008 ADC device, SMA connectors for input/output accesses and a
2.54 mm pitch connector compatible with high-speed acquisition system high-frequency
probes.
The board has been designed for full compatibility with e2v’s DMUX evaluation boards
(AT84CS001-EB). Please refer to user guide reference 0904 and datasheet reference
0809 for more information.
The board also implements a de-embedding fixture in order to facilitate the evaluation of
the high frequency insertion loss of the input microstrip lines. It comprises two dielectric
layers, featuring low insertion loss and enhanced thermal characteristics for operation in
the high frequency domain and extended temperature range.
The board’s dimensions are 120 mm × 150 mm.
The board set comes fully assembled and tested, with the AT84AS008 installed and fea-
tures a heatsink.
AT84AS008-EB - Evaluation Board User Guide
1-1
0906C–BDC–10/07
e2v semiconductors SAS 2007
5 Page 
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Section 3
Operating Procedures and
Characteristics
3.1 Introduction
This section describes a typical single-ended configuration for the analog and clock
inputs.
The single-ended configuration is preferable, as it corresponds to the most straightfor-
ward and quickest AT84AS008-EB board setting for evaluating the AT84AS008 at full
speed in its given temperature range.
The inverted analog input VINB and clock input CLKB common mode level is ground (on-
chip 50Ω-terminated). In this configuration, no balun transformer is needed to correctly
convert the single-ended mixer output to balanced differential signals for the analog
inputs.
In the same way, no balun is necessary to feed the AT84AS008 clock inputs with bal-
anced signals.
The RF sources should be directly connected to the in-phase analog and clock inputs of
the converter. However, dynamic performances can be somewhat improved by entering
either analog or clock inputs in differential mode.
3.2 Operating
1. Connect the power supplies and ground accesses
Procedure (ECL
Mode)
(VCC = +5V, GND = 0V, VPLUSD = 0V, VEE = -5V, DVEE = -5V or -2.2V) through the
dedicated banana jacks.
We recommend you turn the -5V power supply on first (followed by -2.2V if appli-
cable, followed by 5V).
2. The board is set to default digital outputs in binary format.
3. Connect the CLK clock signal. The inverted phase clock input CLKB may be 50Ω
terminated. Use a low phase noise RF source. The clock input level is typically
4 dBm and should not exceed +10 dBm into the 50Ω termination resistor (maxi-
mum ratings for the clock input power level is 15 dBm).
4. Connect the analog signal VIN. The inverted phase clock input VINB may be 50Ω
terminated. Use a low phase noise RF source. The full-scale range is 0.5V peak-
to-peak around 0V (±250 mV) or -2 dBm into 50Ω.
The input frequency can range from DC up to 1.8 GHz. At 3.3 GHz, the ADC
attenuates the input signal by -3 dB.
AT84AS008-EB - Evaluation Board User Guide
3-1
0906C–BDC–10/07
e2v semiconductors SAS 2007
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AT84AS008-EB.PDF ] | |
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