19-4120; Rev 1; 2/11 Low-Charge-Injection, 8-Channel, High-Voltage Analog Switches with 20MHz Serial Interface ♦ Fast SPI™ Interface 20MHz ♦ Pin-Compatible Replacement for Supertex HV2203 (MAX4800A) ♦ Pin-Compatible Replacement for Supertex HV2303 (MAX4802A) ♦ Flexible High-Voltage Supplies Up to VPP - VNN = 200V Ω ♦ Low-Charge-Injection, Low-Capacitance 22Ω Switches ♦ DC to 50MHz Analog-Signal Frequency Range ♦ -77dB Off-Isolation at 5MHz ♦ Low 10µA Quiescent Current ♦ Integrated Bleed Resistors (MAX4802A Only) ♦ Available in Standard PLCC, LQFP, and CSBGA Packages Pin/Bump Configurations TOP VIEW CLR LE CLK DIN N.C. N.C. N.C. VDD Applications Ultrasound Imaging GND N.C. (RGND) N.C. VNN The MAX4800A/MAX4802A provide high-voltage switching on eight channels for ultrasonic imaging and printer applications. The devices utilize BCDMOS process technology to provide eight high-voltage low-chargeinjection SPST switches, controlled by a 20MHz serial interface. Data is clocked into an internal 8-bit shift register and retained by a programmable latch with enable and clear inputs. A power-on reset function ensures that all switches are open on power-up. The devices operate with a wide range of high-voltage supplies including: VPP/VNN = +100V/-100V, +185V/-15V, and +40V/-160V. The digital interface operates from a separate VDD supply from +2.7V to +6V. Digital inputs DIN, CLK, LE, and CLR are +6V tolerant, independent of the VDD supply voltage. The MAX4802A provides integrated 35kΩ bleed resistors on each switch terminal to discharge capacitive loads. The devices are drop-in replacements for the Supertex HV2203 and HV2303. They are available in the 48-pin LQFP, 26-bump CSBGA, and 28-pin PLCC packages. All devices are specified for the commercial 0°C to +70°C temperature range. Features 36 35 34 33 32 31 30 29 28 27 26 25 Printers SECOND SOURCE PINPACKAGE No — 26 CSBGA MAX4800ACQI+ No HV2203PJ-G MAX4800ACCM+* No HV2203FG-G 48 LQFP — 28 PLCC MAX4802ACXZ+* Yes 26 CSBGA MAX4802ACQI+ Yes HV2303PJ-G MAX4802ACCM+* Yes HV2303FG-G 48 LQFP 28 PLCC Note: All devices are specified over the commercial 0°C to +70°C temperature range. *Future product—contact factory for availability. +Denotes a lead(Pb)-free/RoHS-compliant package. 24 VPP 38 23 39 22 N.C. NO0 40 21 41 20 N.C. COM0 N.C. NO7 N.C. COM6 N.C. NO6 42 MAX4800A MAX4802A 43 19 N.C. 18 NO1 17 45 16 N.C. NO5 46 15 47 14 N.C. COM1 N.C. NO2 N.C. 48 13 N.C. 44 + 1 2 3 4 5 6 7 8 9 10 11 12 COM2 MAX4800ACXZ+* BLEED RESISTORS 37 N.C. COM7 N.C. COM3 N.C. NO3 N.C. PART DOUT COM5 N.C. COM4 N.C. NO4 N.C. Ordering Information/ Selector Guide LQFP (7mm x 7mm) () MAX4802A ONLY SPI is a trademark of Motorola, Inc. Pin/Bump Configurations continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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 MAX4800A/MAX4802A General Description MAX4800A/MAX4802A Low-Charge-Injection, 8-Channel, High-Voltage Analog Switches with 20MHz Serial Interface ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) VDD Logic Supply Voltage........................................-0.3V to +7V VPP - VNN Supply Voltage ....................................................220V VPP Positive Supply Voltage......................-0.3V to (VNN + 220V) VNN Negative Supply Voltage ..............................+0.3V to -220V Logic Inputs LE, CLR, CLK, DIN ..............................-0.3V to +7V DOUT..........................................................-0.3V to (VDD + 0.3V) RGND (MAX4802A)...............................................-4.5V to +0.3V COM_, NO_.................................................................VNN to VPP Continuous Power Dissipation (TA = +70°C) 26-Bump CSBGA (derate 11.8mW/°C above +70°C)..941mW 28-Pin PLCC (derate 10.5mW/°C above +70°C) .........842mW 48-Pin LQFP (derate 22.7mW/°C above +70°C)........1818mW Operating Temperature Range...............................0°C to +70°C Storage Temperature Range .............................-65°C to +150°C Junction Temperature ......................................................+150°C Lead Temperature (excluding CSBGA, soldering, 10s) ..+300°C Soldering Temperature (reflow) 28 PLCC.......................................................................+245°C All other packages .......................................................+260°C PACKAGE THERMAL CHARACTERISTICS (Note 1) 26 CSBGA Junction-to-Ambient Thermal Resistance (θJA)...........85°C/W Junction-to-Case Thermal Resistance (θJC)................23°C/W 28 PLCC Junction-to-Ambient Thermal Resistance (θJA)...........44°C/W Junction-to-Case Thermal Resistance (θJC)................10°C/W 48 LQFP Junction-to-Ambient Thermal Resistance (θJA)...........44°C/W Junction-to-Case Thermal Resistance (θJC)................10°C/W Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VDD = +2.7V to +6V, VPP = +40V to (VNN + 200V), VNN = -40V to -160V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS VPP 10 V ANALOG SWITCH Analog-Signal Range VCOM_, VNO_ VNN + 10 (Note 3) TA = 0°C ICOM = 5mA VPP = +40V, VNN = -160V, VCOM_ = 0V Small-Signal Switch On-Resistance 30 26 TA = +70°C ICOM = 200mA R ONS ICOM = 5mA VPP = +100V, VNN = -100V, VCOM_ = 0V TA = +25°C ICOM = 200mA 48 TA = 0°C TA = +25°C 25 22 27 TA = +70°C 32 TA = 0°C 25 TA = +25°C 22 27 TA = +70°C 30 TA = 0°C 18 TA = +25°C 18 TA = +70°C 2 38 _______________________________________________________________________________________ 24 27 Low-Charge-Injection, 8-Channel, High-Voltage Analog Switches with 20MHz Serial Interface (VDD = +2.7V to +6V, VPP = +40V to (VNN + 200V), VNN = -40V to -160V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX 20 25 TA = 0°C ICOM = 5mA Small-Signal Switch On-Resistance R ONS VPP = +160V, VNN = -40V ICOM = 200mA 23 TA = +25°C TA = +70°C 30 TA = 0°C 22 TA = +25°C 16 TA = +70°C Small-Signal Switch On-Resistance Matching RONS 5 15 R ONL VCOM_ = VPP - 10V, ICOM = 1A Shunt Resistance (MAX4802A only) RINT NO_ or COM_ to RGND, switch off 30 ICOM_(OFF), VCOM_, VNO_ = V PP - 10V or unconnected; INO_(OFF) (MAX4800A only) Switch-Off Leakage 25 27 VPP = +100V, VNN = -100V, VCOM_ = 0V, ICOM = 5mA Large-Signal Switch On-Resistance UNITS 20 % 35 50 0 2 10 k μA Switch-Off DC Offset RL = 100k (MAX4800A), no load (MAX4802A) 0 10 mV Switch-On DC Offset RL =100k (MAX4800A), no load (MAX4802A) 0 10 mV Switch-Output Peak Current (Note 4) ICOM_ duty cycle 0.1% Switch-Output Isolation Diode Current TA = 0°C 3 TA = +25°C 2 TA = +70°C 2 A 3 300ns pulse width, 2% duty cycle (Note 4) 300 mA f = 5MHz, RL = 1k, CL = 15pF -30 -33 f = 5MHz, RL = 50 -58 -77 f = 5MHz, RL = 50 (Note 4) -60 -80 CCOM_(OFF), VCOM_ = 0V, VNO_ = 0V, f = 1MHz (Note 4) CNO_ (OFF) 4 11 18 pF 20 36 56 pF +150 mV SWITCH DYNAMIC CHARACTERISITICS Off-Isolation (Note 4) VISO Crosstalk VCT COM_, NO_ Off-Capacitance COM_ On-Capacitance Output Voltage Spike Charge Injection (MAX4802A only) CCOM_ (ON) VSPK Q VCOM_ = 0V, f = 1MHz (Note 4) RL = 50 (Note 4) -150 VPP = +40V, VNN = -160V, VCOM_ = 0V 820 VPP = +100V, VNN = -100V, VCOM_ = 0V 600 VPP = +160V, VNN = -40V, VCOM_ = 0V 350 dB dB pC LOGIC LEVELS Logic-Input Low Voltage Logic-Input High Voltage VIL VIH 0.75 VDD 0.75 V V _______________________________________________________________________________________ 3 MAX4800A/MAX4802A ELECTRICAL CHARACTERISTICS (continued) MAX4800A/MAX4802A Low-Charge-Injection, 8-Channel, High-Voltage Analog Switches with 20MHz Serial Interface ELECTRICAL CHARACTERISTICS (continued) (VDD = +2.7V to +6V, VPP = +40V to (VNN + 200V), VNN = -40V to -160V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS Logic Input Capacitance CIN Logic Input Leakage I IN DOUT Low Voltage VOL I SINK = 1mA DOUT High Voltage VOH I SOURCE = 0.75mA MIN TYP (Note 4) -1 MAX UNITS 10 pF +1 μA 0.4 V VDD 0.5 V POWER SUPPLIES VDD Supply Voltage VDD 2.7 6.0 V V VPP Supply Voltage VPP 40 VNN + 200 VNN Supply Voltage VNN -160 -15 V VDD Supply Quiescent Current IDDQ VIL = 0V, VIH = VPSD, fCLK = 0Hz 3 μA VDD Supply Dynamic Current IDD VDD = +5V, VIL = 0V, VIH = +5V, fCLK = 5MHz 2 mA VPP Supply Quiescent Current I PPQ 50 μA All switches remain on or off, ICOM_(ON) = 5mA VPP = +40V, VNN = -160V VPP Supply Dynamic Current I PP 50kHz output switching frequency with no load VPP = +100V, VNN = -100V VPP = +160V, VNN = -40V VNN Supply Quiescent Current INNQ INN 50kHz output switching frequency with no load VPP = +100V, VNN = -100V VPP = +160V, VNN = -40V 4 TA = 0°C 6.5 TA = +25°C 6.5 TA = +70°C 6.5 TA = 0°C 4.0 TA = +25°C 4.0 TA = +70°C 4.0 TA = 0°C 4.0 TA = +25°C 4.0 TA = +70°C 4.0 All switches remain on or off, ICOM_(ON) = 5mA VPP = +40V, VNN = -160V VNN Supply Dynamic Current 10 10 50 TA = 0°C 6.5 TA = +25°C 6.5 TA = +70°C 6.5 TA = 0°C 4.0 TA = +25°C 4.0 TA = +70°C 4.0 TA = 0°C 4.0 TA = +25°C 4.0 TA = +70°C 4.0 _______________________________________________________________________________________ mA μA mA Low-Charge-Injection, 8-Channel, High-Voltage Analog Switches with 20MHz Serial Interface (VDD = +2.7V to +6V, VPP = +40V to (VNN + 200V), VNN = -40V to -160V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ANALOG SWITCH Turn-On Time tON VNO_ = VPP - 10V, RL = 10kΩ, VNN = -40V to -160V 5 µs Turn-Off Time tOFF VNO_ = VPP - 10V, RL = 10kΩ, VNN = -40V to -160V 5 µs Output Switching Frequency fSW Duty cycle = 50% 50 kHz Maximum VCOM_, VNO_ Slew Rate dV/dt (Note 4) CLK Frequency fCLK Daisy chaining DIN to CLK Setup Time tDS DIN to CLK Hold Time tDH CLK to LE Setup Time tCS LE Low Pulse Width tWL CLR High Pulse Width tWC CLK Rise and Fall Times (Note 4) t R , tF CLK to DOUT Delay tDO 20 V/ns LOGIC TIMING (Figure 1) VDD = +5V ±10% 20 VDD = +3V ±10% 10 VDD = +5V ±10% 10 VDD = +3V ±10% 16 VDD = +5V ±10% 3 VDD = +3V ±10% 3 VDD = +5V ±10% 36 VDD = +3V ±10% 65 VDD = +5V ±10% 14 VDD = +3V ±10% 22 VDD = +5V ±10% 20 VDD = +3V ±10% 40 MHz ns ns ns ns ns VDD = +5V ±10% 50 VDD = +3V ±10% 50 VDD = +5V ±10%, CL ≤ 20pF 6 42 VDD = +3V ±10%, CL ≤ 20pF 12 80 ns ns Note 2: Specifications at 0°C are guaranteed by correlation and design. Note 3: The analog-signal input VCOM_ and VNO_ must satisfy VNN ≤ (VCOM_, VNO_) ≤ VPP, or remain unconnected during power-up and power-down. Note 4: Guaranteed by design and characterization; not production tested. _______________________________________________________________________________________ 5 MAX4800A/MAX4802A TIMING CHARACTERISTICS Typical Operating Characteristics (VDD = +5V, VPP = +100V, VNN = -100V, TA = +25°C, unless otherwise noted.) IDD SUPPLY CURRENT vs. CLOCK FREQUENCY 0.7 0.6 0.5 DIN = 01010101 0.3 25 ON-RESISTANCE (Ω) -90 30 -85 -80 -75 MAX4800A/2A toc03 -95 OFF-ISOLATION (dB) 0.8 RS = RL = 50Ω MAX4800A/2A toc02 -100 MAX4800A/2A toc01 ISW = 5mA 20 15 ISW = 200mA 10 -70 0.2 5 -65 0.1 DIN = 00000000 -60 0 0.01 0.1 1 0 1 10 10 20 30 50 60 ON-RESISTANCE vs. VPP/VNN SUPPLY VOLTAGE CLK TO DOUT DELAY vs. TEMPERATURE SUPPLY CURRENT vs. SWITCHING FREQUENCY VDD = +3V 140 120 tDO (ns) 25 20 100 15 VDD = +5V 80 60 TA = 0°C TA = +25°C 40 5 20 0 0 +60/ -140 +80/ -120 +100/ +120/ -100 -80 +140/ +160/ -60 -40 6.0 ALL SWITCHES OPERATING ALL SWITCHES CONNECTED TO GND 5.0 INN 4.0 IPP 3.0 2.0 1.0 IDD 0 0 10 20 30 40 50 60 70 0 10 20 30 40 50 60 70 80 90 100 TEMPERATURE (°C) SWITCHING FREQUENCY (kHz) SUPPLY CURRENT vs. VPP/VNN SUPPLY VOLTAGE INN 0.35 IPP 0.30 MAX4800A/2A toc08 3.5 RISING 3.0 LOGIC THRESHOLD (V) SUPPLY CURRENT (mA) 0.40 ONE SWITCH OPERATING ALL SWITCHES CONNECTED TO GND fSW = 50kHz LOGIC THRESHOLD vs. VDD SUPPLY VOLTAGE MAX4800A/2A toc07 0.45 2.5 FALLING 2.0 1.5 1.0 0.25 0.5 0.20 0 +40/ -160 +60/ -140 +80/ -120 70 MAX4800A/2A toc06 TA = +70°C 160 SUPPLY CURRENT (mA) MAX4800A/2A toc04 30 180 VPP/VNN SUPPLY VOLTAGE (V) +100/ +120/ -100 -80 +140/ +160/ -60 -40 2 3 4 5 VDD SUPPLY VOLTAGE (V) 6 VPP/VNN SUPPLY VOLTAGE (V) 6 40 TEMPERATURE (°C) 35 +40/ -160 10 FREQUENCY (MHz) 40 10 0 CLOCK FREQUENCY (MHz) MAX4800A/2A toc05 IDD SUPPLY CURRENT (mA) 0.9 0.4 ON-RESISTANCE vs. TEMPERATURE OFF-ISOLATION vs. FREQUENCY 1.0 ON-RESISTANCE (Ω) MAX4800A/MAX4802A Low-Charge-Injection, 8-Channel, High-Voltage Analog Switches with 20MHz Serial Interface _______________________________________________________________________________________ Low-Charge-Injection, 8-Channel, High-Voltage Analog Switches with 20MHz Serial Interface PIN/BUMP MAX4800A LQFP MAX4800A CSBGA MAX4800A PLCC NAME FUNCTION 1 E4 26 COM5 Analog Switch 5—Common Terminal 2, 4, 6, 7, 9, 11, 13, 15, 17, 19, 21, 23, 26, 27, 30, 31, 32, 38, 40, 42, 44, 46, 48 D6 9, 11, 15 N.C. 3 E1 27 COM4 5 E3 28 NO4 8 D1 1 COM3 10 D3 2 NO3 12 D4 3 COM2 14 C3 4 NO2 16 C4 5 COM1 18 A4 6 NO1 No Connection. Not connected internally. Analog Switch 4—Common Terminal Analog Switch 4—Normally Open Terminal Analog Switch 3—Common Terminal Analog Switch 3—Normally Open Terminal Analog Switch 2—Common Terminal Analog Switch 2—Normally Open Terminal Analog Switch 1—Common Terminal Analog Switch 1—Normally Open Terminal 20 C5 7 COM0 22 D5 8 NO0 Analog Switch 0—Normally Open Terminal Analog Switch 0—Common Terminal 24 C6 10 VPP Positive High-Voltage Supply. Bypass V PP to GND with a 0.1μF or greater ceramic capacitor. 25 C7 12 VNN Negative High-Voltage Supply. Bypass VNN to GND with a 0.1μF or greater ceramic capacitor. 28 D7 13 GND Ground 29 D9 14 VDD Digital Supply Voltage. Bypass VDD to GND with a 0.1μF or greater ceramic capacitor. 33 E9 16 DIN Serial-Data Input 34 E7 17 CLK Serial-Clock Input 35 E6 18 LE 36 F7 19 CLR Latch Clear Input 37 F6 20 DOUT Serial-Data Output 39 E5 21 COM7 41 F5 22 NO7 43 F4 23 COM6 45 H4 24 NO6 Analog Switch 6—Normally Open Terminal 47 F3 25 NO5 Analog Switch 5—Normally Open Terminal Latch-Enable Input, Active Low Analog Switch 7—Common Terminal Analog Switch 7—Normally Open Terminal Analog Switch 6—Common Terminal _______________________________________________________________________________________ 7 MAX4800A/MAX4802A Pin/Bump Descriptions MAX4800A/MAX4802A Low-Charge-Injection, 8-Channel, High-Voltage Analog Switches with 20MHz Serial Interface Pin/Bump Descriptions (continued) PIN/BUMP MAX4802A LQFP MAX4802A CSBGA MAX4802A PLCC NAME FUNCTION 1 E4 26 COM5 Analog Switch 5—Common Terminal 2, 4, 6, 7, 9, 11,13, 15, 17, 19, 21, 23, 26, 30, 31, 32, 38, 40, 42, 44, 46, 48 — 9, 15 N.C. 8 3 E1 27 COM4 5 E3 28 NO4 8 D1 1 COM3 10 D3 2 NO3 12 D4 3 COM2 14 C3 4 NO2 No Connection. Not connected internally. Analog Switch 4—Common Terminal Analog Switch 4—Normally Open Terminal Analog Switch 3—Common Terminal Analog Switch 3—Normally Open Terminal Analog Switch 2—Common Terminal Analog Switch 2—Normally Open Terminal 16 C4 5 COM1 18 A4 6 NO1 Analog Switch 1—Common Terminal 20 C5 7 COM0 22 D5 8 NO0 Analog Switch 0—Normally Open Terminal Analog Switch 1—Normally Open Terminal Analog Switch 0—Common Terminal 24 C6 10 VPP Positive High-Voltage Supply. Bypass V PP to GND with a 0.1μF or greater ceramic capacitor. 25 C7 12 VNN Negative High-Voltage Supply. Bypass VNN to GND with a 0.1μF or greater ceramic capacitor. 27 D6 11 RGND 28 D7 13 GND Ground 29 D9 14 VDD Digital Supply Voltage. Bypass VDD to GND with a 0.1μF or greater ceramic capacitor. Bleed Resistor Ground 33 E9 16 DIN Serial-Data Input 34 E7 17 CLK Serial-Clock Input 35 E6 18 LE 36 F7 19 CLR Latch Clear Input Serial-Data Output 37 F6 20 DOUT 39 E5 21 COM7 41 F5 22 NO7 Latch-Enable Input, Active Low Analog Switch 7—Common Terminal Analog Switch 7—Normally Open Terminal 43 F4 23 COM6 45 H4 24 NO6 Analog Switch 6—Normally Open Terminal Analog Switch 6—Common Terminal 47 F3 25 NO5 Analog Switch 5—Normally Open Terminal _______________________________________________________________________________________ Low-Charge-Injection, 8-Channel, High-Voltage Analog Switches with 20MHz Serial Interface 50% DN+1 50% DN MAX4800A/MAX4802A DIN DN-1 tWL 50% 50% LE tCS 50% 50% CLK tDH tDS tDO DOUT tON ON 90% SWITCH 10% OFF tOFF CLR 50% 50% tWC *FOR SLOWER CLK RATES REFER TO THE MAX4800/MAX4801/MAX4802 DATA SHEET. Figure 1. Serial Interface Timing* Detailed Description The MAX4800A/MAX4802A provide high-voltage switching on eight channels for ultrasound imaging and printer applications. The devices utilize BCDMOS process technology to provide eight high-voltage lowcharge-injection SPST switches, controlled by a 20MHz serial interface. Data is clocked into an internal 8-bit shift register and retained by a programmable latch with enable and clear inputs. A power-on reset function ensures that all switches are open on power-up. The devices operate with a wide range of high-voltage supplies including: V PP /V NN = +100V/-100V, +185V/-15V, or +40V/-160V. The digital interface operates from a separate VDD supply from +2.7V to +6V. Digital inputs DIN, CLK, LE, and CLR are +6V tolerant, independent of the VDD supply voltage. The MAX4802A provides integrated 35kΩ bleed resistors on each switch terminal to discharge capacitive loads. The devices are drop-in replacements for the Supertex HV2203 and HV2303, respectively. Analog Switch The devices allow a peak-to-peak analog-signal range from VNN + 10V to VPP - 10V. Analog switch inputs must be unconnected, or satisfy V NN ≤ (V COM_ , VNO_) ≤ VPP during power-up and power-down. High-Voltage Supplies The devices allow a wide range of high-voltage supplies. The devices operate with V NN from -160V to -15V and VPP from +40V to (VNN + 200V). When VNN is connected to GND (single-supply applications), the devices operate with V PP up to +200V. _______________________________________________________________________________________ 9 MAX4800A/MAX4802A Low-Charge-Injection, 8-Channel, High-Voltage Analog Switches with 20MHz Serial Interface LE CLK DIN D7 D6 D5 D4 D3 D2 D1 MSB DOUT D7 D0 LSB D6 D5 D4 D3 D2 D1 D0 D7 DATA FROM PREVIOUS DATA BYTE POWER-UP DEFAULT: D7–D0 = 0 Figure 2. Latch-Enable Interface Timing The V PP and V NN high-voltage supplies are not required to be symmetrical, but the voltage difference VPP - VNN must not exceed 200V. Bleed Resistors (MAX4802A) The MAX4802A features integrated 35kΩ bleed resistors to discharge capacitive loads such as piezoelectric transducers. Each analog-switch terminal is connected to RGND with a bleed resistor. Serial Interface The devices are controlled by a serial interface with an 8-bit serial shift register and transparent latch. Each of the eight data bits controls a single analog switch (see Table 1). Data on DIN is clocked with the most significant bit (MSB) first into the shift register on the rising edge of CLK. Data is clocked out of the shift register onto DOUT on the rising edge of CLK. DOUT reflects the status of DIN, delayed by eight clock cycles (see Figures 1 and 2). 10 Latch Enable (LE) Drive LE logic-low to change the contents of the latch and update the state of the high-voltage switches (Figure 2). Drive LE logic-high to freeze the contents of the latch and prevent changes to the switch states. To reduce noise due to clock feedthrough, drive LE logichigh while data is clocked into the shift register. After the data shift register is loaded with valid data, pulse LE logic-low to load the contents of the shift register into the latch. Latch Clear (CLR) The devices feature a latch clear input. Drive CLR logic-high to reset the contents of the latch to zero and open all switches. CLR does not affect the contents of the data shift register. Pulse LE logic-low to reload the contents of the shift register into the latch. Power-On Reset The devices feature a power-on reset circuit to ensure all switches are open at power-on. The internal 8-bit serial shift register and latch are set to zero on power-up. ______________________________________________________________________________________ Low-Charge-Injection, 8-Channel, High-Voltage Analog Switches with 20MHz Serial Interface DATA BITS D0 (LSB) D1 D2 D3 D4 CONTROL BITS D5 D6 D7 (MSB) L H L H L H L H L H L H L H X X X X X X X X X X X X X X L H X X FUNCTION LE CLR SW0 L L L L L L L L L L L L L L L L H X L L L L L L L L L L L L L L L L L H Off On SW1 SW2 SW3 SW4 SW5 SW6 SW7 Off On Off On Off On Off On Off On Off On Off On Off Off Off Hold Previous State Off Off Off Off Off X = Don’t care. Applications Information Logic Levels The devices’ digital interface inputs CLK, DIN, LE, and CLR are tolerant of up to +6V, independent of the VDD supply voltage, allowing compatibility with higher voltage controllers. Supply Sequencing and Bypassing The devices do not require special sequencing of the VDD, VPP, and VNN supply voltages; however, analog switch inputs must be unconnected, or satisfy VNN ≤ (V COM_ , V NO_ ) ≤ V PP during power-up and powerdown. Bypass VDD, VNN, and VPP to GND with a 0.1µF ceramic capacitor as close to the device as possible. Daisy Chaining Multiple Devices Digital output DOUT is provided to allow the connection of multiple devices by daisy-chaining (Figure 3). 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 may be included anywhere in series with the MAX4800A/ MAX4802A data chain. Chip Information PROCESS: BCDMOS ______________________________________________________________________________________ 11 MAX4800A/MAX4802A Table 1. Serial Interface Programming MAX4800A/MAX4802A Low-Charge-Injection, 8-Channel, High-Voltage Analog Switches with 20MHz Serial Interface U10 DIN DIN U11 DIN DOUT MAX4800A CLK CLK LE LE DOUT U1n DIN MAX4800A LE MAX4800A CLK CLK CLR DOUT LE CLR CLR CLR Figure 3. Interfacing Multiple Devices by Daisy-Chaining Functional Diagrams VDD VPP MAX4800A COM0 LEVEL SHIFTER DIN CLK NO0 SHIFT REGISTER LATCH DOUT COM7 LEVEL SHIFTER CLR NO7 LE GND 12 VNN ______________________________________________________________________________________ Low-Charge-Injection, 8-Channel, High-Voltage Analog Switches with 20MHz Serial Interface VDD VPP MAX4802A COM0 LEVEL SHIFTER DIN CLK NO0 SHIFT REGISTER LATCH COM7 DOUT LEVEL SHIFTER CLR NO7 LE VNN GND RGND 2 COM4 NO3 3 COM5 COM2 4 NO4 NO2 TOP VIEW COM3 Pin/Bump Configurations (continued) 1 28 27 26 + COM1 5 25 NO5 NO1 6 24 NO6 COM0 7 23 COM6 MAX4800A MAX4802A DOUT N.C. (RGND) 11 19 CLR 12 13 14 15 16 17 18 LE 20 CLK 10 DIN COM7 VPP N.C. NO7 21 VDD 22 9 VNN 8 N.C. GND NO0 PLCC () MAX4802A ONLY ______________________________________________________________________________________ 13 MAX4800A/MAX4802A Functional Diagrams (continued) Low-Charge-Injection, 8-Channel, High-Voltage Analog Switches with 20MHz Serial Interface MAX4800A/MAX4802A Pin/Bump Configurations (continued) TOP VIEW 2 1 3 4 5 6 7 8 9 + A4 A MAX4800A MAX4802A NO1 B C3 C4 C5 C6 C7 NO2 COM1 COM0 VPP VNN D5 D6 D7 C D E D1 D3 D4 COM3 NO3 COM2 NO0 N.C. (RGND) GND D9 VDD E1 E3 E4 E5 E6 E7 E9 COM4 NO4 F3 COM5 F4 COM7 F5 LE F6 CLK F7 DIN NO5 COM6 NO7 DOUT CLR F G H4 H NO6 CSBGA () MAX4802A ONLY Package Information For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. 14 PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 26 CSBGA X07265+1 21-0158 90-0184 28 PLCC Q28+13 21-0049 90-0235 48 LQFP C48+6 21-0054 90-0093 ______________________________________________________________________________________ Low-Charge-Injection, 8-Channel, High-Voltage Analog Switches with 20MHz Serial Interface REVISION NUMBER REVISION DATE 0 5/08 Initial release 2/11 Changed the DC analog-signal frequency range to 50MHz in the Features section; changed the TQFP package to LQFP in the General Description, Ordering Information, Features, Pin/Bump Configurations, Pin/Bump Descriptions, and Package Information 1 DESCRIPTION PAGES CHANGED — 1, 8, 14 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc. MAX4800A/MAX4802A Revision History