MAX1204ACPP Maxim Integrated, MAX1204ACPP Datasheet

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MAX1204ACPP

Manufacturer Part Number
MAX1204ACPP
Description
Analog to Digital Converters - ADC
Manufacturer
Maxim Integrated
Datasheet

Specifications of MAX1204ACPP

Number Of Channels
8/4
Architecture
SAR
Conversion Rate
133 KSPs
Resolution
10 bit
Input Type
Single-Ended/Differential
Snr
66 dB
Interface Type
4-Wire (SPI, Microwire, TMS320)
Operating Supply Voltage
4.75 V to 5.25 V
Maximum Operating Temperature
+ 70 C
Package / Case
PDIP N
Maximum Power Dissipation
640 mW
Minimum Operating Temperature
0 C
Number Of Converters
1
Voltage Reference
4.096 V
The MAX1204 is a 10-bit data-acquisition system
specifically designed for use in applications with mixed
+5V (analog) and +3V (digital) supply voltages. It oper-
ates with a single +5V analog supply or dual ±5V ana-
log supplies, and combines an 8-channel multiplexer,
internal track/hold, and serial interface with high con-
version speed and low power consumption.
A 4-wire serial interface connects directly to
SPI/MICROWIRE
serial strobe output allows direct connection to
TMS320-family digital signal processors. The MAX1204
uses either the internal clock or an external serial-inter-
face clock to perform successive-approximation ana-
log-to-digital conversions. The serial interface operates
at up to 2MHz.
The MAX1204 features an internal 4.096V reference and
a reference-buffer amplifier that simplifies gain trim. It
also has a V
puts. Output logic levels (3V, 3.3V, or 5V) are determined
by the value of the voltage applied to this pin.
A hard-wired SHDN pin and two software-selectable
power-down modes are provided. Accessing the serial
interface automatically powers up the device. A quick
turn-on time allows the MAX1204 to be shut down
between conversions, enabling the user to optimize
supply currents. By customizing power-down between
conversions, supply current can drop below 10µA at
reduced sampling rates.
The MAX1204 is available in 20-pin SSOP and PDIP
packages, and is specified for the commercial and
extended temperature ranges.
________________________Applications
MICROWIRE is a registered trademark of National Semiconductor Corp.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
Typical Operating Circuit appears on last page.
_______________General Description
5V/3V Mixed-Supply Systems
Data Acquisition
Process Control
Battery-Powered Instruments
Medical Instruments
L
pin that supplies power to the digital out-
®
devices without external logic, and a
5V, 8-Channel, Serial, 10-Bit ADC
with 3V Digital Interface
o 8-Channel Single-Ended or 4-Channel Differential
o Operates from +5V Single or ±5V Dual Supplies
o User-Adjustable Output Logic Levels (2.7V to
o Low Power: 1.5mA (Operating Mode)
o Internal Track/Hold, 133kHz Sampling Rate
o Internal 4.096V Reference
o SPI/MICROWIRE/TMS320-Compatible 4-Wire
o Software-Configurable Unipolar/Bipolar Inputs
o 20-Pin PDIP/SSOP
o Pin-Compatible 12-Bit Upgrade: MAX1202
____________________________Features
Ordering Information continued at end of data sheet.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
MAX1204ACPP+
MAX1204BCPP+
MAX1204ACAP+
MAX1204BCAP+
__________________Pin Configuration
______________Ordering Information
Inputs
5.25V)
Serial Interface
TOP VIEW
PART
SHDN
2µA (Power-Down Mode)
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
V
SS
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
10
1
2
3
4
5
6
7
8
9
+
PDIP/SSOP
MAX1204
MAX1204
PIN-
PACKAGE
20 PDIP
20 PDIP
20 SSOP
20 SSOP
19
18
17
16
15
14
13
12
11
20
V
SCLK
CS
DIN
SSTRB
DOUT
V L
GND
REFADJ
REF
19-1179; Rev 1; 1/12
DD
M ARK
±1/2
±1/2
TOP
±1
±1

Related parts for MAX1204ACPP

MAX1204ACPP Summary of contents

Page 1

... Internal Track/Hold, 133kHz Sampling Rate o Internal 4.096V Reference o SPI/MICROWIRE/TMS320-Compatible 4-Wire Serial Interface o Software-Configurable Unipolar/Bipolar Inputs o 20-Pin PDIP/SSOP o Pin-Compatible 12-Bit Upgrade: MAX1202 ______________Ordering Information PART MAX1204ACPP+ MAX1204BCPP+ MAX1204ACAP+ MAX1204BCAP+ Ordering Information continued at end of data sheet. + Denotes a lead(Pb)-free/RoHS-compliant package. __________________Pin Configuration TOP VIEW MAX1204 2µ ...

Page 2

... P-P SINAD THD SFDR V = 4.096 V , 65kHz (Note 4) IN P-P -3dB rolloff = +70°C) A MIN TYP MAX UNITS 10 Bits ±0.5 LSB ±1.0 ±1.0 LSB ±1.0 LSB ±2.0 ±1.0 LSB ±2.0 ±0.8 ppm/°C ±0.1 LSB -75 dB 4.5 MHz 800 kHz Maxim Integrated ...

Page 3

... REFADJ Adjustment Range EXTERNAL REFERENCE AT REF (Buffer disabled, V Input Voltage Range Input Current Input Resistance REF Input Current in Shutdown REFADJ Buffer Disable Threshold Maxim Integrated 5V, 8-Channel, Serial, 10-Bit ADC with 3V Digital Interface = 0V or -5V ±5 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion SS SCLK ...

Page 4

... SS PSR full-scale input PSR External reference, 4.096V; full-scale input MIN TYP MAX UNITS 0 µF 4.7 1.68 V/V ±50 µA µA 5 ± ±5% V 1.5 2 µ µA 10 2.70 5. µA ±0.06 ±0.5 mV ±0.01 ±0.5 mV ±0.06 ±0.5 mV Maxim Integrated ...

Page 5

... Output Voltage High Three-State Leakage Current Three-State Output Capacitance DIGITAL OUTPUTS: DOUT, SSTRB (V Output Voltage Low Output Voltage High Three-State Leakage Current Three-State Output Capacitance Maxim Integrated 5V, 8-Channel, Serial, 10-Bit ADC with 3V Digital Interface = 0V or -5V ±5 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion SS SCLK = ...

Page 6

... DOUT and SSTRB. SCLK -5% only. SUPPLY = 3.6V unless otherwise noted.) MIN TYP 1.5 100 20 100 0 200 200 = 100pF LOAD = 100pF LOAD 0 or GND (Figure 12c); L MAX UNITS µ 240 ns 240 ns 240 240 ns 240 ns 240 ns ns Maxim Integrated ...

Page 7

... Serial-Clock Input. SCLK clocks data in and out of serial interface. In external clock mode, SCLK also 19 SCLK sets the conversion speed. (Duty cycle must be 40% to 60% in external clock mode Positive Supply Voltage, +5V ±5% DD Maxim Integrated 5V, 8-Channel, Serial, 10-Bit ADC with 3V Digital Interface = 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps); SUPPLY CURRENT vs. TEMPERATURE 2.0 1.8 1 ...

Page 8

... SAR 7 CH6 ADC 8 CH7 13 REF GND ≈ 1.68 A +2.44V 20k REFERENCE 12 +4.096V 11 REF from the positive input (IN+) to the HOLD +) - (V -)] from C to the binary-weighted IN HOLD 15 OUTPUT DOUT SHIFT 16 REGISTER SSTRB OUT MAX1204 . The HOLD as a HOLD Maxim Integrated ...

Page 9

... C2 C1 0.01µF 4.7µF FULL-SCALE ANALOG INPUT Figure 5. Quick-Look Circuit Maxim Integrated 5V, 8-Channel, Serial, 10-Bit ADC with 3V Digital Interface Track/Hold impedances can be used if an input capacitor is con- nected to the analog inputs, as shown in Figure 5. Note that the input capacitor forms an RC filter with the input source impedance, limiting the ADC’ ...

Page 10

... ADC, and two more 8-bit transfers to clock out the con- version result). NEGATIVE ZERO FULL SCALE SCALE -4.096V -1 REFADJ 0V REFADJ 1.68 at REF -1 REF How to Start a Conversion Maxim Integrated FULL SCALE +4.096V / 2 +1/2 V REFADJ x 1.68 +1/2 V REF ...

Page 11

... Maxim Integrated 5V, 8-Channel, Serial, 10-Bit ADC with 3V Digital Interface Bit 5 Bit 4 Bit 3 SEL 1 SEL 0 UNI/BIP Description can be converted; in bipolar mode, the signal can range REF / REF REF PD0 Mode 0 Full power-down (I ...

Page 12

... SSTRB does not go high impedance when CS goes high. Figure 10 shows the SSTRB timing in internal clock mode. Data can be shifted in and out of the MAX1204 at clock rates up to 2.0MHz if the acquisition time, t kept above 1.5µs. External Clock Internal Clock , is ACQ Maxim Integrated ...

Page 13

... CSH SCLK DIN t DV DOUT Figure 7. Detailed Serial-Interface Timing CS t SDV SSTRB SCLK Figure 8. External Clock-Mode SSTRB Detailed Timing Maxim Integrated 5V, 8-Channel, Serial, 10-Bit ADC with 3V Digital Interface t ACQ 8 12 PD1 PD0 RB2 MSB 1.5µs CONVERSION • • • ...

Page 14

... SCLK clocks; 16 clocks per conversion is typically the fastest that a µC can drive the MAX1204. Figure 11b shows the serial-interface timing necessary to perform a conversion every 16 SCLK cycles in external clock mode FILLED WITH ZEROS LSB IDLE t CSS t SCK 24 Maxim Integrated ...

Page 15

... In addition to its shutdown function, SHDN also selects internal or external compensation. The compensation affects both power-up time and maximum conversion speed. Compensated or not, the minimum clock rate is 100kHz due to droop on the sample-and-hold. Maxim Integrated 5V, 8-Channel, Serial, 10-Bit ADC with 3V Digital Interface 8 15 ...

Page 16

... DEVICE MODE STATE V DD Open GND Software Power-Down POWER-UP DELAY (µs) Fast 5 Full 300 See Figure 14c Fast 2 Full 2 DEVICE REFERENCE-BUFFER MODE COMPENSATION Enabled Internal compensation Enabled External compensation Full N/A Power-Down MAXIMUM SAMPLING RATE (ksps 133 133 133 Maxim Integrated ...

Page 17

... Power-Down Sequencing The MAX1204’s automatic power-down modes can save considerable power when operating at less than maximum sample rates. The following sections discuss the various power-down sequences. Maxim Integrated 5V, 8-Channel, Serial, 10-Bit ADC with 3V Digital Interface EXTERNAL SETS FAST POWER-DOWN ...

Page 18

... RC = 20kΩ REFADJ t BUFFEN External Reference . In power-down, the input bias current Pull REFADJ to GND to minimize the input bias Transfer Function and Gain Adjust (ZEROS) CH1 CH7 NOPD FULLPD ≈ 15µs Internal Reference FASTPD Maxim Integrated ...

Page 19

... Figure 14b. MAX1204 Supply Current vs. Sample Rate/Second, FASTPD, 2MHz Clock Figure 17, the Reference-Adjust Circuit, shows how to adjust ADC gain in applications that use the internal reference. The circuit provides ±1.5% (±16 LSBs) of gain-adjustment range. Maxim Integrated 5V, 8-Channel, Serial, 10-Bit ADC with 3V Digital Interface 8 CHANNELS 1 CHANNEL 300 ...

Page 20

... Figure 16. Bipolar Transfer Function, ±4.096V/2 = Full Scale 20 100kΩ +4.096V 1 LSB = FS 1024 Figure 17. Reference-Adjust Circuit 3/2 LSB + *OPTIONAL Figure 18. Power-Supply Grounding Connection + LSB +5V MAX1204 510kΩ REFADJ 12 0.01µF 24kΩ SUPPLIES -5V + 10Ω GND MAX1204 GND DGND DIGITAL CIRCUITRY Maxim Integrated ...

Page 21

... Pull CS high to disable the MAX1204 until the next conversion is initiated. CS SCLK DIN START SEL2 SEL1 SSTRB DOUT Figure 20. TMS320 Serial-Interface Timing Diagram Maxim Integrated 5V, 8-Channel, Serial, 10-Bit ADC with 3V Digital Interface TMS320LC3x Figure 19. MAX1204 to TMS320 Serial Interface SEL0 UNI/BIP SGL/DIF PD1 PD0 MAX1204 XF ...

Page 22

... PDIP 20 SSOP +5V CH0 0.1µF V MAX1204 L GND CH7 SCLK REF DIN C1 DOUT 4.7µF SSTRB REFADJ SHDN Package Information PACKAGE OUTLINE NO. TYPE CODE P20+3 21-0043 A20+2 21-0056 + 0.1µF CPU I/O SCK (SK) MOSI (SO) MISO (SI LAND PATTERN NO. — 90-0094 Maxim Integrated ...

Page 23

... Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 © 2012 Maxim Integrated 5V, 8-Channel, Serial, 10-Bit ADC with 3V Digital Interface DESCRIPTION The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc. MAX1204 Revision History PAGES CHANGED — ...

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