Time-to-Digital Converter. MAX35101 Datasheet

MAX35101 Converter. Datasheet pdf. Equivalent

MAX35101 Datasheet
Recommendation MAX35101 Datasheet
Part MAX35101
Description Time-to-Digital Converter
Feature MAX35101; MAX35101 EVALUATION KIT AVAILABLE Time-to-Digital Converter with Analog Front-End General Descript.
Manufacture Maxim Integrated
Datasheet
Download MAX35101 Datasheet





Maxim Integrated MAX35101
MAX35101
EVALUATION KIT AVAILABLE
Time-to-Digital Converter with Analog Front-End
General Description
The MAX35101 is a time-to-digital converter with built-in
amplifier and comparator targeted as a complete analog
front-end (AFE) solution for the ultrasonic heat meter and
flow meter markets.
With a time measurement accuracy of 20ps and auto-
matic differential time-of-flight (TOF) measurement, this
device makes for simplified computation of liquid flow.
Early edge detection ensures measurements are made
with consistent wave patterns to greatly improve accuracy
and eliminate erroneous measurements.
Multihit capability with stop-enable windowing allows
the device to be fine-tuned for the application. Internal
analog switches, an autozero amplifier/comparator, real-
time clock (RTC), and programmable receiver sensitivity
provide the analog interface and control for a minimal
electrical bill of material solution. The RTC provides an
event timing mode that is configurable and runs cyclic
algorithms to minimize microprocessor interactivity and
increase battery life.
Built-in arithmetic logic unit provides TOF difference mea-
surements. A programmable receiver hit accumulator can
be utilized to minimize the host microprocessor access
and thus minimize current consumption.
For temperature measurement, the MAX35101 supports
up to four (4) 2-wire PT1000/500 platinum resistive tem-
perature detectors (RTD).
A simple 4-wire SPI interface allows any microcon-
troller to effectively configure the device for its intended
measurement.
On-board 8KB user flash allows the MAX35101 to be
nonvolatile-configurable and provide nonvolatile energy
use data to be logged. Configuration can be recalled any-
time with a SPI command.
Benefits and Features
● High Accuracy Flow Measurement for Billing
and Leak Detection
• Time-to-Digital Accuracy Down to 20ps
• Measurement Range Up to 8ms
• Two Channels: Single-Stop Channel
● High Accuracy Temperature Measurement for
Precise Heat and Flow Calculations
• Up to Four (4) 2-Wire Sensors
• PT1000 and PT500 RTD Support
● Maximizes Battery Life with Low Device and
Overall System Power
Low 10μA ToF measurement and < 125nA
Duty-Cycled Temperature Measurement
Event Timing Mode Reduces Host μC
● Overhead to Minimize System Power Consumption
• 2.3V to 3.6V Single-Supply Operation
● High-Integration Solution Minimizes Parts Count
and Reduces BOM Cost
• 8KB of Nonvolatile Flash Memory for Data Logging
• Built-in Real Time Clock
• Small, 5mm x 5mm, 32-Pin TQFP Package
• -40°C to +85°C Operation
Applications
● Ultrasonic Heat Meters
● Ultrasonic Water Meters
● Ultrasonic Gas Meters
Ordering Information appears at end of data sheet.
19-6830; Rev 1; 1/15



Maxim Integrated MAX35101
MAX35101
Time-to-Digital Converter with Analog Front-End
Absolute Maximum Ratings
(Voltages relative to ground.)
Voltage Range on VCC Pins.................................-0.5V to +4.0V
Voltage Range on All Other Pins
(not to exceed 4.0V).............................. -0.5V to (VCC + 0.5V)
Continuous Power Dissipation (TA = +70°C)
TQFP (derate 27.80mW/ºC above +70°C)............2222.20mW
Operating Temperature Range............................ -40°C to +85°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -55°C to +125°C
Lead Temperature (soldering, 10s).................................. +300°C
Soldering Temperature (reflow)........................................+260°C
ESD Protection (All Pins, Human Body Model)...................±2kV
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.
Package Thermal Characteristics (Note 1)
TQFP
Junction-to-Ambient Thermal Resistance (θJA)...........36°C/W
Junction-to-Case Thermal Resistance (θJC)......................4°C/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Recommended Operating Conditions
(TA = -40°C to +85°C, unless otherwise noted.) (Notes 2, 3)
PARAMETER
Supply Voltage
Input Logic 1
(RST, CSW, SCK, DIN, CE)
Input Logic 0
(RST, CSW, SCK, DIN, CE)
Input Logic 1 (32KX1)
Input Logic 0 (32KX1)
SYMBOL
VCC
VIH
VIL
VIH32KX1
VIL32KX1
CONDITIONS
MIN TYP MAX UNITS
2.3 3.0 3.6
V
VCC x 0.7
VCC + 0.3
V
-0.3 VCC x 0.3
VCC x 0.85 VCC + 0.3
-0.3 VCC x 0.15
V
V
V
Electrical Characteristics
(VCC = 2.3V to 3.6V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = 3.0V and TA = +25°C.) (Notes 2, 3)
PARAMETER
Input Leakage
(CSW, RST, SCK, DIN, CE)
Output Leakage
(INT, WDO, T1,T2,T3,T4)
Output Voltage Low (32KOUT)
Output Voltage High (32KOUT)
Output Voltage High
(DOUT, CMP_OUT/UP_DN)
Output Voltage High (TC)
SYMBOL
IL
CONDITIONS
VOL32K
VOH32K
VOH
VOHTC
2mA
-1mA
-4mA
VCC = 3.3V, IOUT = -4mA
MIN TYP MAX UNITS
-0.1
+0.1
µA
-0.1 +0.1
0.8 x VCC
0.2 x VCC
0.8 x VCC
2.9 3.1
µA
V
V
V
V
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Maxim Integrated 2



Maxim Integrated MAX35101
MAX35101
Time-to-Digital Converter with Analog Front-End
Electrical Characteristics (continued)
(VCC = 2.3V to 3.6V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = 3.0V and TA = +25°C.) (Notes 2, 3)
PARAMETER
Output Voltage High
(Launch_UP, Launch_DN)
Output Voltage Low (WDO, INT,
DOUT, CMP_OUT/UP_DN)
Pulldown Resistance (TC)
Input Voltage Low (TC)
Output Voltage Low
(Launch_UP, Launch_DN)
Resistance (T1, T2, T3, T4)
Input Capacitance
(CE, SCK, DIN, RST, CSW)
RST Low Time
CURRENT
Standby Current
32kHz OSC Current
4MHz OSC Current
LDO Bias Current
Time Measurement Unit Current
Calculator Current
Device Current Drain
FLASH Erase Current
ANALOG RECEIVER
SYMBOL
CONDITIONS
VOHLAUCH VCC = 3.3V, IOUT = -50mA
VOL 4mA
RTC
VILTC
VOLLAUCH VCC = 3.3V, IOUT = 50mA
RON
CIN Not tested
tRST
IDDQ
I32KHZ
I4MHZ
ICCLDO
ICCTMU
ICCCPU
ICC3
ICC6
IFLASH
No oscillators running, TA = +25°C
32kHz oscillator only (Note 4)
4MHz oscillator only (Note 4)
ICCCPU = 0 (Note 4)
(Note 4)
TOF_DIFF = 2 per second (3 hits),
temperature = 1 per 30s
TOF_DIFF = 2 per second (6 hits),
temperature = 1 per 30s
Analog Input Voltage
(STOP_UP, STOP_DN)
VANA
Input Offset Step Size
STOP_UP/STOP_DN Bias Voltage
Receiver Sensitivity
TIME MEASUREMENT UNIT
Measurement Range
Time Measurement Accuracy
Time Measurement Resolution
VSTEP
VBIAS
VANA
Stop hit detect level (Note 5)
tMEAS
tACC
tRES
Time of flight
Differential time measurement
MIN TYP MAX UNITS
2.8 3.0
V
0.2 x VCC
650 1000 1500
0.36 x VCC
0.2 0.4
1
7
100
V
V
V
pF
ns
0.1 1
0.5 0.9
40 85
15 35
4.5 8
2.5 5
10
13
0.5 1
µA
µA
µA
µA
mA
mA
µA
mA
2x
10 700 VCC x
(3/8)
1
VCC x (3/8)
10
mVP-P
mV
V
mVP-P
8
8000
µs
20 ps
3.8 ps
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Maxim Integrated 3





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