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PDF MAX4968A Data sheet ( Hoja de datos )
| Número de pieza | MAX4968A | |
| Descripción | High-Voltage Analog Switches | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-5786; Rev 2; 1/12
16-Channel, Linear, High-Voltage
Analog Switches
General Description
The MAX4968/MAX4968A are 16-channel, high-linearity,
high-voltage, bidirectional SPST analog switches with
18I (typ) on-resistance. The devices are ideal for use in
applications requiring high-voltage switching controlled
by a low-voltage control signal, such as ultrasound imag-
ing and printers. The MAX4968A provides integrated
40kI (typ) bleed resistors on each switch terminal to
discharge capacitive loads. Using HVCMOS technol-
ogy, these switches combine high-voltage bilateral MOS
switches and low-power CMOS logic to provide efficient
control of high-voltage analog signals.
The MAX4968 is pin-to-pin compatible with the MAX14802
and Supertex HV2601. The MAX4968A is pin-to-pin
compatible with the MAX14803 and Supertex HV2701.
The only difference is the VPP positive supply voltage
level. The MAX4968/MAX4968A require a low +10V (typ)
voltage (VPP), whereas the MAX14802/MAX14803 and
HV2601/HV2701 require a high +100V supply voltage.
In a typical ultrasound application, these devices do not
require a dedicated high-voltage supply that implies a sig-
nificant simplification of system requirement. The negative
voltage supply can be shared with the transmitter, and the
positive voltage supply is typically +10V.
The devices are available in the 48-pin LQFP package
and are specified over the -40NC to +85NC extended
temperature range.
Features
S Latch Free
SOI HVCMOS Process Technology for High
Performance and Robustness
S No Dedicated High-Voltage Supplies Required
S RON Flatness Guaranteed in Entire Input Range
S Low-Power Dissipation
S Low-Charge Injection and Voltage Spike
S 25MHz Serial Interface (+2.5V to +5V)
S 2nd Harmonic Distortion < -45dB at 2MHz ± 90V
Pulse
S Low Parasitic Capacitance Guarantees High
Bandwidth
S DC to 30MHz Small-Signal Analog Bandwidth
(CLOAD = 200pF)
S 500kHz to 20MHz High-Signal Analog Bandwidth
(CLOAD = 200pF)
S Extended Input Range Up to 210VP-P
S -80dB (typ) Off-Isolation at 5MHz (50I)
S Shunt (Bleed) Resistors on Outputs (MAX4968A
Only)
S Daisy-Chainable Serial Interface
Applications
Medical Ultrasound Imaging
Nondestructive Testing (NDT)/Industrial
Ultrasound Imaging
Printers
Ordering Information/Selector Guide
PART
TEMP RANGE
MAX4968ECM+
MAX4968AECM+
-40°C to +85°C
-40°C to +85°C
+Denotes a lead(Pb)-free/RoHS-compliant package.
SWITCH CHANNELS
16
16
BLEED RESISTOR
No
Yes
PIN-PACKAGE
48 LQFP
48 LQFP
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
16-Channel, Linear, High-Voltage
Analog Switches
SW_A
ILEAK
SW_B
ILEAK
AA
MAX4968
MAX4968A
VPP VPP
VNN VNN
VDD 5V
GND
SWITCH-OFF LEAKAGE
VIN = 10VP-P
AT 5MHz
SW_A
VOUT
RL
SW_B
MAX4968
MAX4968A
VPP VPP
VNN VNN
VDD 5V
GND
VISO
=
20log
VOUT
VIN
OFF-ISOLATION
Test Circuits/Timing Diagrams
VOUT
RL
100kΩ
SW_A
SW_B
MAX4968
MAX4968A
VPP - 10V
RL
100kΩ
VOUT
SW_A
SW_B
MAX4968
MAX4968A
VPP VPP
VNN VNN
VDD 5V
GND
DC OFFSET ON/OFF
VOUT
SW_A
IID
SW_B
VNN
MAX4968
MAX4968A
VPP VPP
VDD 5V
VNN VNN
GND
ISOLATION DIODE
CURRENT
VPP VPP
VNN VNN
VDD
GND
VIN = 10VP-P
AT 5MHz
tON/tOFF TEST CIRCUIT
5V
50Ω
VPP
VNN
SW_A
SW_B
SW_A
SW_B
MAX4968
MAX4968A
VPP VDD
VNN GND
VCT
=
20log
VOUT
VIN
CROSSTALK
50Ω
5V
VOUT
VOUT
100pF
SW_A
VCOM_
VPP
VNN
SW_B
MAX4968
MAX4968A
VPP VDD
VNN GND
Q = 1000pF x VOUT
CHARGE INJECTION
5V
+VSPK
-VSPK
50Ω
VOUT
SW_A
SW_B
RL
1kΩ
MAX4968
VPP VPP MAX4968A VDD 5V
VNN VNN
GND
OUTPUT VOLTAGE SPIKE
10mVP-P
VIN SW_A
SW_B VOUT
MAX4968
MAX4968A
200pF 60VP-P BURST
(1% DUTY CYCLE)
VIN SW_A
SW_B VOUT
200pF
MAX4968
MAX4968A
Figure 1. Test Circuits
VPP VPP
VNN VNN
VDD 5V
GND
SMALL-SIGNAL
BANDWIDTH MEASUREMENT
VPP VPP
VNN VNN
VDD 5V
GND
LARGE-SIGNAL
BANDWIDTH MEASUREMENT
5
5 Page 
16-Channel, Linear, High-Voltage
Analog Switches
Table 1. Serial Interface Programming (Notes 1–6) (continued)
DATA BITS
CONTROL
BITS
FUNCTION
D8
D9
D10
D11
D12
D13
D14
D15
(MSB)
LE
CLR SW8 SW9 SW10 SW11 SW12 SW13 SW14 SW15
L L L Off
H L L On
L
LL
Off
H
LL
On
L
LL
Off
H
LL
On
L
LL
Off
H
LL
On
L LL
Off
H LL
On
L LL
Off
H LL
On
L LL
Off
H LL
On
L LL
Off
H LL
On
X XX XXXX X H L
Hold Previous State
X X X X X X X X X H Off Off Off Off Off Off Off Off
Note 1: The 16 switches operate independently.
Note 2: Serial data is clocked in on the rising edge of CLK.
Note 3: The switches go to a state retaining their present condition on the rising edge of LE. When LE is low, the shift register data
flows through the latch.
Note 4: DOUT is high when switch 15 is on.
Note 5: Shift register clocking has no effect on the switch states if LE is high.
Note 6: The CLR input overrides all other inputs.
Applications Information
In typical ultrasound applications, the MAX4968/MAX4968A
do not require dedicated high-voltage supplies; the nega-
tive voltage supply can be shared with the transmitter and
the positive voltage supply is typically +10V. See Figures 5,
6, and 7 for medical ultrasound applications.
Logic Levels
The MAX4968/MAX4968A digital interface inputs CLK,
DIN, LE, and CLR operate on the VDD logic supply voltage.
Daisy-Chaining Multiple Devices
Digital output DOUT is provided to allow the connec-
tion of multiple MAX4968/MAX4968A devices by daisy-
chaining (Figure 4). Connect each DOUT to the DIN of
the subsequent device in the chain. Connect CLK, LE,
and CLR inputs of all devices, and drive LE logic-low
to update all devices simultaneously. Drive CLR high
to open all the switches simultaneously. Additional shift
registers can be included anywhere in series with the
MAX4968/MAX4968A daisy-chain.
Supply Sequencing and Bypassing
The MAX4968/MAX4968A do not require special
sequencing of the VDD, VPP, and VNN supply voltages.
Bypass VDD, VPP, and VNN to GND with a 0.1FF ceramic
capacitor as close as possible to the device.
Note: Keep LE low during power-up.
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MAX4968A.PDF ] | |
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