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PDF CXA3246Q Data sheet ( Hoja de datos )
| Número de pieza | CXA3246Q | |
| Descripción | 8-bit 120MSPS Flash A/D Converter | |
| Fabricantes | Sony Corporation | |
| Logotipo |  |
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CXA3246Q
8-bit 120MSPS Flash A/D Converter
Description
The CXA3246Q is an 8-bit high-speed flash A/D
converter capable of digitizing analog signals at the
maximum rate of 120MSPS. ECL, PECL or TTL can
be selected as the digital input level in accordance
with the application. The TTL digital output level
allows 1: 2 demultiplexed output.
Features
• Differential linearity error: ±0.5LSB or less
• Integral linearity error: ±0.5LSB or less
• High-speed operation with a maximum conversion
rate of 120MSPS
• Low input capacitance: 10pF
• Wide analog input bandwidth: 250MHz
• Low power consumption: 500mW
• 1: 2 demultiplexed output
• 1/2 frequency-divided clock output
(with reset function)
• Compatible with ECL, PECL and TTL digital input
levels
• TTL output "H" levels: 2.8V (Typ.)
• +3.3V line CMOS IC direct connecting available
• Single +5V power supply operation available
• Surface mounting package (48-pin QFP)
Pin Configuration (Top View)
48 pin QFP (Plastic)
LEAD TREATMENT: PALLADIUM PLATING
Structure
Bipolar silicon monolithic IC
Applications
• Magnetic recording (PRML)
• Communications (QPSK, QAM)
• LCDs
• Digital oscilloscopes
12 11 10 9 8 7 6 5 4 3 2 1
CLK/E 13
CLKN/E 14
48 RESETN/E
47 RESET/E
CLK/T 15
46 RESETN/T
N.C. 16
45 SELECT
N.C. 17
N.C. 18
DVCC2 19
44 INV
43 CLKOUT
42 DVCC2
DGND2 20
PAD0 21
41 DGND2
40 PBD7
PAD1 22
39 PBD6
PAD2 23
38 PBD5
PAD3 24
37 PBD4
25 26 27 28 29 30 31 32 33 34 35 36
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
–1–
E97902A8X-PS
1 page  
Pin Description and I/O Pin Equivalent Circuit
Pin Symbol I/O Standard
No. voltage level
Equivalent circuit
3, 10 AGND
GND
5, 8 AVCC
20, 29 DGND1
32, 41 DGND2
19, 30 DVCC1
31, 42 DVCC2
12 DGND3
1 DVEE3
16, 17
18
N.C.
+5V
(typ.)
GND
+5V
(typ.)
+5V (typ.)
(With a
single
power
supply)
GND
(With dual
power
supply)
GND
(With a
single
power
supply)
–5V (typ.)
(With dual
power
supply)
CXA3246Q
Description
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.
No connected pin.
Not connected with the internal
circuits.
–5–
5 Page 
CXA3246Q
Electrical Characteristics Measurement Circuit
Current Consumption Measurement Circuit
5V 5V
Sampling Delay Measurement Circuit
Aperture Jitter Measurement Circuit
100MHz
Amp
4V VRT
Icc
AVCC
DVCC1
DVCC2
IEE
DGND3
OSC1
φ: Variable
fr
VIN
CLK
8
CXA3246Q
Logic
Analizer
1.95V
VIN
CLK/E
5MHz PECL
OSC2
1024
samples
2V VRB
DGND2
DGND1
AGND
DVEE3
100MHz
ECL
Buffer
Integral Linearity Error Measurement Circuit
Differential Linearity Error Measurement Circuit
+V
S2
S1: ON when A < B
S1 S2: ON when A > B
Aperture Jitter Measurement Method
VIN
CLK
VRT
VRM2
VRB
VIN
DVM
8
CXA3246Q
–V
A<B A>B
Comparator
A8 B8 8
to to
A1 B1
A0 B0
“0” “1”
Controller
Buffer
000···00
to
111···10
Error Rate Measurement Circuit
∆υ 129
∆t
VIN
128
127
σ (LSB)
126
125
CLK Sampling timing fluctuation
(= aperture jitter)
Where σ (LSB) is the deviation of the output codes when
the largest slew rate point is sampled at the clock which
has exactly the same frequency as the analog input
signal, the aperture jitter Taj is:
Taj = σ/
∆υ
∆t
= σ/ ( 256
2
× 2πf )
Signal
Source
VIN
Fc
4
– 1kHz
2Vp-p Sine Wave
CXA3246Q
8
Latch
CLK CLK
A
B
Comparator
A>B
+ Latch
Pulse
Counter
Signal
Source
Fc
16LSB
1/8
– 11 –
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet CXA3246Q.PDF ] | |
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