T YPICAL APPLICATION
F EATURES
A PPLICATIONS
D ESCRIPTION 1- and 2-Channel ADCs in MSOP
The L TC ®1860/L TC1861 are 12-bit A/D converters that are offered in MSOP and SO-8 packages and operate on a single 5V supply. At 250ksps, the supply current is only 850μA. The supply current drops at lower speeds because the L TC1860/L TC1861 automatically power down to a typical supply current of 1nA between conversions. These 12-bit switched capacitor successive approximation ADCs include sample-and-holds. The L TC1860 has a differential analog input with an adjustable reference pin. The L TC1861 offers a software-selectable 2-channel MUX and an adjustable reference pin on the MSOP version.
The 3-wire, serial I/O, MSOP or SO-8 package and extremely high sample rate-to-power ratio make these ADCs ideal choices for compact, low power , high speed systems.运动控制器
These ADCs can be used in ratiometric applications or with external references. The high impedance analog in-puts and the ability to operate with reduced spans down to 1V full scale, allow direct connection to signal sources in many applications, eliminating the need for external gain stages.
Single 5V Supply, 250ksps, 12-Bit Sampling ADC
n
12-Bit 250ksps ADCs in MSOP Package n Single 5V Supply
n Low Supply Current: 850μA (Typ)
n Auto Shutdown Reduces Supply Current to 2μA at 1ksps n T rue Differential Inputs
n 1-Channel (L TC1860) or 2-Channel (L TC1861) Versions
n SPI/MICROWIRE TM Compatible Serial I/O n
High Speed Upgrade to L TC1286/L TC1298n Pin Compatible with 16-Bit L TC1864/L TC1865n Guaranteed Operation to 125°C (MSOP Package)
n
High Speed Data Acquisition
n Portable or Compact Instrumentation
n Low Power Battery-Operated Instrumentation n
Isolated and/or Remote Data Acquisition
All other trademarks are the property of their respective owners.
Supply Current vs Sampling Frequency
SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP OR SHIFT REGISTERS
SAMPLING FREQUENCY (kHz)
0.01
S U P P L Y C U R R E N T (M A )
1000
100
10
1
0.1
0.011001860 TA02
0.11
公共厕所TOILET101000
A BSOLUTE MAXIMUM RATINGS Supply Voltage (V CC ) .................................................7V Ground Voltage Difference
AGND, DGND L TC1861 MSOP Package .............±0.3V Analog Input ....................(GND – 0.3V) to (V CC + 0.3V)Digital Input ....................................(GND – 0.3V) to 7V Digital Output ...................(GND – 0.3V) to (V CC + 0.3V)
(Notes 1, 2)
P IN CONFIGURATION Power Dissipation ..............................................400mW Operating Temperature Range
L TC1860C/L TC1861C ...............................0°C to 70°C L TC1860I/L TC1861I .......................... –40°C to 85°C L TC1860H/L TC1861H .........................–40°C to 125°C Storage Temperature Range ...................–65°C to 150°C Lead Temperature (Soldering, 10 sec) ..................300°C
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE L TC1860CMS8#PBF L TC1860CMS8#TRPBF L TWR8-Lead Plastic MSOP0°C to 70°C
L TC1860IMS8#PBF L TC1860IMS8#PBF L TWS8-Lead Plastic MSOP–40°C to 85°C
L TC1860HMS8#PBF L TC1860HMS8#PBF L TWS8-Lead Plastic MSOP–40°C to 125°C
L TC1860CS8#PBF L TC1860CS8#PBF18608-Lead Plastic SO0°C to 70°C
L TC1860IS8#PBF L TC1860IS8#PBF1860I8-Lead Plastic SO–40°C to 85°C
L TC1861CMS#PBF L TC1861CMS#PBF L TWT10-Lead Plastic MSOP0°C to 70°C
L TC1861IMS#PBF L TC1861IMS#PBF L TWU10-Lead Plastic MSOP–40°C to 85°C
L TC1861HMS#PBF L TC1861HMS#PBF L TWU10-Lead Plastic MSOP–40°C to 125°C
L TC1861CS8#PBF L TC1861CS8#PBF18618-Lead Plastic SO0°C to 70°C
L TC1861IS8#PBF L TC1861IS8#PBF1861I8-Lead Plastic SO–40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE L TC1860CMS8L TC1860CMS8L TWR8-Lead Plastic MSOP0°C to 70°C
L TC1860IMS8L TC1860IMS8L TWS8-Lead Plastic MSOP–40°C to 85°C
L TC1860HMS8L TC1860HMS8L TWS8-Lead Plastic MSOP–40°C to 125°C
L TC1860CS8L TC1860CS818608-Lead Plastic SO0°C to 70°C
L TC1860IS8L TC1860IS81860I8-Lead Plastic SO–40°C to 85°C
L TC1861CMS L TC1861CMS L TWT10-Lead Plastic MSOP0°C to 70°C
L TC1861IMS L TC1861IMS L TWU10-Lead Plastic MSOP–40°C to 85°C
L TC1861HMS L TC1861HMS L TWU10-Lead Plastic MSOP–40°C to 125°C
L TC1861CS8L TC1861CS818618-Lead Plastic SO0°C to 70°C
L TC1861IS8L TC1861IS81861I8-Lead Plastic SO–40°C to 85°C
Consult L TC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container. For more information on lead free part marking, go to: www.linear/leadfree/
For more information on tape and reel specifi cations, go to: www.linear/tapeandreel/
CONVERTER AND MULTIPLEXER CHARACTERISTICS
SYMBOL CONDITIONS
MIN TYP MAX UNITS Resolution
l 12Bits No Missing Codes Resolution l
12
Bits
INL
(Note 3)l ±1
LSB T ransition Noise 0.07
LSB RMS
Gain Error l ±20
mV Offset Error
L TC1860 SO-8 and MSOP , L TC1861 MSOP
L TC1861 SO-8l l ±2±3
±5±7mV mV Input Differential Voltage Range V IN = IN + – IN –l
0V REF V Absolute Input Range IN + Input IN – Input
–0.05–0.05V CC + 0.05V CC /2V V V REF Input Range
L TC1860 SO-8 and MSOP , L TC1861 MSOP 1
V CC V Analog Input Leakage Current (Note 4)l ±1
μA C IN Input Capacitance
In Sample Mode During Conversion
125
The ● denotes specifi cations which apply over the full operating temperature range, otherwise specifi cations are T A = 25°C.V CC = 5V , V REF = 5V , f SCK = f SCK(MAX) as defi ned in Recommended Operating Conditions, unless otherwise noted.
DYNAMIC ACCURACY
SYMBOL PARAMETER CONDITIONS
MIN
TYP MAX
UNITS SNR Signal-to-Noise Ratio
72dB S/(N + D)Signal-to-Noise Plus Distortion Ratio 100kHz Input Signal 71dB THD
Total Hamonic Distortion Up to 5th Harmonic 100kHz Input Signal 77dB Full Power Bandwidth 20MHz Full Linear Bandwidth
S/(N + D) ≥ 68dB 125
kHz
T A = 25°C. V CC = 5V , f SAMPLE = 250kHz, unless otherwise specifi ed.
DIGITAL AND DC ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
CONDITIONS MIN
TYP MAX UNITS
V IH High Level Input Voltage V CC = 5.25V l 2.4
V V IL Low Level Input Voltage V CC = 4.75V l 0.8V I IH High Level Input Current V IN = V CC l 2.5μA I IL Low Level Input Current V IN = 0V
l –2.5
μA V OH High Level Output Voltage V CC = 4.75V , I O = 10μA
V CC = 4.75V , I O = 360μA l
l 4.52.4 4.744.72
V V
V OL
Low Level Output Voltage
安徽省化工
设计院V CC = 4.75V , I O = 1.6mA l
0.4
V
The ● denotes specifi cations which apply
over the full operating temperature range, otherwise specifi cations are T A = 25°C. V CC = 5V , V REF = 5V , unless otherwise noted.
DIGITAL AND DC ELECTRICAL CHARACTERISTICS The●denotes specifi cations which apply over the full operating temperature range, otherwise specifi cations are T A = 25°C. V CC = 5V, V REF = 5V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS I OZ Hi-Z Output Leakage CONV = V CC l±3μA I SOURCE Output Source Current V OUT = 0V–25mA I SINK Output Sink Current V OUT = V CC20mA
I REF Reference Current (L TC1860 SO-8,
MSOP and L TC1861 MSOP)CONV = V CC
f SMPL = f SMPL(MAX)
l
l
0.001
0.05
3
0.1
μA
mA
I CC Supply Current CONV = V CC After Conversion
CONV = V CC After Conversion, H-Grade
f SMPL = f SMPL(MAX)l
l
l
0.001
0.001
3
5
1.3
μA
μA
mA
P D Power Dissipation f SMPL = f SMPL(MAX) 1.25mV RECOMMENDED OPERATING CONDITIO
NS The●denotes specifi cations which apply over the full operating temperature range, otherwise specifi cations are T A = 25°C.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V CC Supply Voltage 4.75 5.25V
f SCK Clock Frequency
H-Grade l
l
20
16.7
MHz
MHz
t CYC Total Cycle Time12 • SCK + t CONVμs
t SMPL Analog Input Sampling Time L TC1860 (Note 5)
L TC1861 (Note 5)12
10
SCK
SCK
t suCONV Setup Time CONV↓ Before First SCK↑,
(See Figure 1)H-Grade 60
65
30
30
ns
ns
t hDI Holdtime SDI After SCK↑L TC186115ns t suDI Setup Time SDI Stable Before SCK↑L TC186115ns t WHCLK SCK High Time f SCK = f SCK(MAX)40%1/f SCK t WLCLK SCK Low Time f SCK = f SCK(MAX)40%1/f SCK t WHCONV CONV High Time Between Data T ransfer
Cycles
(Note 5)t CONVμs t WLCONV CONV Low Time During Data T ransfer(Note 5)12SCK t hCONV Hold Time CONV Low After Last SCK↑13ns
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
Note 2: All voltage values are with respect to GND.
Note 3: Integral nonlinearity is defi ned as deviation of a code from a straight line passing through the actual endpoints of the transfer curve. The deviation is measured from the center of the quantization band.Note 4: Channel leakage current is measured while the part is in sample mode.
Note 5: Guaranteed by design, not subject to test.
SYMBOL PARAMETER
CONDITIONScic滤波器
MIN TYP MAX UNITS
t CONV Conversion Time (See Figure 1)
H-Grade
l
l 2.752.75
3.23.3
μs μs f SMPL(MAX)Maximum Sampling Frequency
H-Grade
l l 250248
kHz kHz
t dDO
Delay Time, SCK ↓ to SDO Data Valid
C LOA
D = 20pF C LOAD = 20pF C LOAD = 20pF , H-Grade l l 15
202530ns ns ns t dis Delay Time, CONV ↑ to SDO Hi-Z
H-Grade
l l 30306065ns ns t en Delay Time, CONV ↓ to SDO Enabled C LOAD = 20pF C LOAD = 20pF , H-Grade l l 3030
6065
ns ns t hDO Time Output Data Remains Valid After
SCK ↓C LOAD = 20pF l
5
10ns t r SDO Rise Time C LOAD = 20pF 8ns t f
SDO Fall Time
C LOA
D = 20pF 4
ns
TIMING CHARACTERISTICS
The ● denotes specifi cations which apply over the full operating temperature range, otherwise specifi cations are T A = 25°C. V CC = 5V , V REF = 5V , f SCK = f SCK(MAX) as defi ned in Recommended Operating Conditions, unless otherwise noted.
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