TDC1011_15 Datasheet, PDF (6/49 Pages) Texas Instruments – TDC1011 Single Channel Ultrasonic Sensing Analog Front End (AFE) for Level Sensing,Concentration Sensing Applications

TDC1011
SNAS662 – JULY 2015
www.ti.com
Electrical Characteristics (continued)
The electrical ratings specified in this section apply to all specifications in this document, unless otherwise noted. These
specifications are interpreted as conditions that do not degrade the device parametric or functional specifications for the life of
the product containing it. T_A = 25°C, V_DD = V_IO = 3.7 V, V_COM = V_CM = V_DD / 2, C_VCOM = 10 nF (unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
ZERO CROSS COMPARATOR
V_OS(COMP)
Input offset voltage⁽²⁾
en_COMP
Zero crossing
comparator input
referred noise⁽²⁾
HYST_COMP Hysteresis ⁽²⁾
THRESHOLD DETECTOR
Referred to V_COM
1 MHz
Referred to V_COM
±115
5
-10
µV
nV/√Hz
mV
V_THDET
Threshold level
ECHO_QUAL_THLD = 0h, V_COM referred
ECHO_QUAL_THLD = 7h, V_COM referred
TEMPERATURE SENSOR INTERFACE⁽³⁾
T_ERROR
Temperature
R_REF = 1 kΩ, PT1000 range: –40 to 125°C⁽⁴⁾
measurement accuracy _{RREF = 1 kΩ, PT1000 range: –15°C to 85°C}⁽⁴⁾
Relative accuracy
R_REF = 1 kΩ, R_RTD1 = R_RTD2 = 1.1 kΩ
TG_E
Gain error
POWER SUPPLY
–35
–1.5
1
0.5
0.02
5.8
mV
V
°C
°C
°C_RMS
m°C/°C
Sleep (EN = CLKIN = TRIGGER = low)
0.61
µA
Continuous receive mode, LNA and PGA
bypassed
I_DD
VDD supply current
Continuous receive mode, LNA and PGA active
Temp. measurement only (PT1000 mode)⁽⁵⁾
Temp. measurement (PT500 mode)⁽⁶⁾
2.8
3 mA
6.2
7.5 mA
370
400 µA
500
540 µA
I_IO
VIO supply sleep
current ⁽²⁾
Sleep (EN = CLKIN = TRIGGER = low)
2
nA
DIGITAL INPUT/OUTPUT CHARACTERISTICS
V_IL
Input logic low
threshold
0.2 × V_IO
V
V_IH
Input logic high
threshold
0.8 × V_IO
V
SDO pin, 100-μA current
0.2 V
SDO pin, 1.85-mA current
0.4 V
V_OL
Output logic low
threshold
START and STOP pins, 100-μA current
START and STOP pins, 1.85-mA current
0.5 V
0.6 V
ERRB pin, 100-μA current
0.2 V
ERRB pin, 1.85-mA current
0.4 V
SDO pin, 100-μA current
V_IO – 0.2
V
SDO pin, 1.85-mA current
V_IO – 0.6
V
V_OH
Output logic high
threshold
START and STOP pins, 100-μA current
V_IO – 0.5
V
START and STOP pins, 1.85-mA current
V_IO – 0.6
V
ERRB pin, 0-µA current
V_IO – 0.2
V
I_OMAX
Maximum output
current for SDO,
START and STOP
1.85
mA
(2) Specified by design.
(3) With ideal external components. For more detail see Temp Sensor Measurement section.
(4) PT1000 RTD approximate resistance: 800 Ω ≡ –52°C, 931 Ω ≡ –18°C, 1.10 kΩ ≡ 26°C, 1.33 kΩ ≡ 86°C and 1.48 kΩ ≡ 125°C.
(5) Specified currents include 120μA which flows through the RTD sensor in PT1000 mode (TEMP_RTD_SEL = 0).
(6) Specified currents include 240μA which flows through the RTD sensor in PT500 mode (TEMP_RTD_SEL = 1).
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