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Part: CXA1843Q
Category:
Description: High-speed Sample-and-hold ic
Company: Sony Electronics
Datasheet: Download CXA1843Q datasheet File size : 441 kB
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CXA1843Q
High-Speed Sample-and-Hold IC For the availability of this product, please contact the sales office.
Description The CXA1843Q is a bipolar IC designed to sampleand-hold video and various other signals with high speed. It is ideal for video and other signal conversions. Features · Maximum operating rate = 33MHz (min.) · Low power consumption: 320mW · S/H clock pulse generator circuit · Built-in clock pulse generator for A/D converter Applications When used in combination of the CXA1844Q, the CXA1843Q achieves A/D conversion. Absolute Maximum Ratings (Ta = 25°C) · Supply voltage VCC 7 V VEE 7 V · Input voltage (VIN pin) VIN VEE to AVCC + 0.3 V (REFIN pin) VREFIN +1 to AVCC + 0.3 V (CLKIN pin) VCLK GND 0.5 to DVCC + 0.3 V (REX 2, 3, 4 pins) VREX2, 3, 4 GND to GND + 4 V · Reference voltage (REFFB pin) VREFFB VEE to +3 V (REFOUT pin) VREFOUT VEE to AVCC + 0.3 V · Output current (REFFOUT pin) IREFOUT 1 to +1 mA (SHOUT pin) ISHOUT 12 to +12 mA (CLKOUT pin) IADC 1.5 to +1.5 mA · Storage temperature Tstg 65 to +150 °C · Allowable power dissipation PD 1.1 W Operating Conditions · Supply voltage VCC VEE · Operating temperature Topr 32 pin QFP (PIastic)
Structure Bipolar silicon monolithic IC Block Diagram and Pin Configuration
CLKOUT REF IN DVCC2 DVCC1 AVCC4
17 NC REFFB REFOUT AVEE3 AVCC3 SHOUT AVEE2 NC 14 SAMPLE HOLD PULSE GENERATOR 13 12 11 SAMPLE HOLD 10 9 1 2 3 4 5 6 7 8
GND
NC
24 NC 25 DVEE1 26 REX3 27 REX4 28 DVEE2 29 DVCC3 30 CLK IN 31 NC 32
23
22
21 20
19 18
REX2 NC
A/D CONVERTER PULSE GENERATOR
REF DC 16 SHIFT 15
AVCC1
CGND
AVEE1
HGND
VIN
4.75 to 5.25 4.75 to 5.25 20 to +75
V V °C
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
NC
NC
E92855B7Y
CXA1843Q
Pin Description Pin No. 1 Symbol AVCC1 Pin voltage 5V (Typ.)
AVCC1
Equivalent circuit
Description Analog positive power supply.
2
HGND
0V
Internal resistance GND for sample-and-hold.
HGND VIN 130 30k
3
VIN
--
DVEE2
Sample-and-hold-input.
4
AVEE1
5V (Typ.)
Analog negative power supply.
5
CGND
0V
AVCC1 AVEE1 500µ 500µ CGND
Internal capacitance GND for sample-and-hold.
DVEE2
6 7 8 9 10
NC NC NC NC AVEE2
-- -- -- -- 5V (Typ.)
AVCC3
Connect to AGND. Connect to AGND. Connect to AGND. Connect to AGND. Analog negative power supply.
11
SHOUT
SHOUT
Sample-and-hold output.
DVEE2
2
CXA1843Q
Pin No. 12 13
Symbol AVCC3 AVEE3
Pin voltage 5V (Typ.) 5V (Typ.) 2.8V As shown in the Application Circuit, PNP TR. is connected and 2.5V is applied to Pin18. 2V As shown in the Application Circuit, PNP TR. is connected and 2.5V is applied to Pin18. -- 5V (Typ.)
AVCC4
Equivalent circuit
Description Analog positive power supply. Analog negative power supply.
AVCC4 400µ 130 REFFB REFOUT
14
REFOUT
Connect the base of the external PNP transistor to create a 2V power supply.
15
REFFB
AVEE3
DVEE2
Connect the emitter of the external PNP transistor to create a 2V power supply.
16 17
NC AVCC4
Connect to AGND. Analog positive power supply.
18
REFIN
2.5V (Typ.)
D
REFIN 130 GND DVEE2 300µ
External DC input for adjusting the 2V power supply.
VCC2
19
REX2
Approx. 0.5V When external resistor is connected between Pin 19 and AGND
REX2 GND DVEE2
1k 130 0.5V
Connect external resistor that determines the time interval (T2) between master clock (MCLK) rise and A/D converter clock (A/D CLK) fall. (Normally connect to 1.6k)
20
NC
--
Connect to AGND.
3
CXA1843Q
Pin No. 21
Symbol GND
Pin voltage 0V
Equivalent circuit GND
DVCC2
Description
H: DVCC2 0.78V 22 CLKOUT L: DVCC2 1.52V (Typ.)
600 CLKOUT 2.2mA GND DVEE2
A/D converter clock (A/D CLK) output.
23 24 25 26
DVCC1 DVCC2 NC DVEE1
5V (Typ.) 5V (Typ.) -- 5V (Typ.) Approx. 0.5V When external resistor is connected between Pin 27 and DGND Approx. 0.5V When external resistor is connected between Pin 28 and DGND 5V (Typ.) 5V (Typ.)
DVCC3 DVCC2
Digital positive power supply. Digital positive power supply. Connect to DGND Digital negative power supply. Connect external resistor that determines the time interval (T3) between master clock (MCLK) rise and sample-and-hold internal clock (S/H CLK) rise. (Normally connect 2.7k)
1k 130 0.5V
27
REX3
1k REX3 REX4 GND DVEE2 130
28
REX4
Connect external resistor that determines the time interval (T4) between master clock (MCLK) rise and sample-and-hold internal clock (S/H CLK) rise. (Normally connect 1.5k) Digital negative power supply. Digital positive power supply.
29 30
DVEE2 DVCC3
31
CLKIN
--
CLKIN GND
130
Master clock (MCLK) input. TTL level. (Vth = 1.5V)
300µ
DVEE2
32
NC
--
Connect to DGND.
4
CXA1843Q
Electrical Characteristics Item Maximun operating rate Current consumption S/H Amplifier Block VIN input current VIN input voltage range Droop Feed through IVIN VIN HMDR HMTH VIN = 1V FIN = 1kHz, distortion factor 55dB VIN = 2V to 0V FIN = 16.5MHz (2Vp-p) VIN = 1V, FCLK = 33MHz FIN = 1kHz (2Vp-p), FCLK = 33MHz 20Log (VO (16.5MHz)/VO (200kHz)), Sampling time = 14ns CL = 50pF Symbol FC ICC IEE Conditions
(Ta = 25°C, VCC = 5V, VEE = 5V) Min. 33 32 28 41 23 50 18 Typ. Max. Unit MHz mA mA
1 2.2 20 40 55 0.5 1 140
20
50 0.2
µA V mV/µs dB mV dB dB V/µs
20 50 90 0.3 0.2 160
80 70 120 0.5 1 200
S/H output offset voltage VOFFSET S/H output gain S/H output frequency response S/H output slew rate Reference Amplifier Block REFIN input current REFFB output voltage Digital I/O Block CLKIN input current ICLKL ICLKH VCLKL VCLKH CLKIN clock width A/D clock low level A/D clock high level TPWH TPWL VADCL VADCH IREFIN VREFFB Gsh Fsh SR
VREFIN = 2.5V VREFIN = 2.5V
0 2.2
1 2.0
10 1.8
µA V
VCLKIN = 0V VCLKIN = 5V
10 0
6 0
0 1 0.8
µA µA V V ns ns
CLKIN input voltage
2.0 9 9 VCC 1.52 VCC 1.40 VCC 0.90 VCC 0.78
V V
5
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