TI ADC104S021 Adc084s021 4-channel, 50 ksps to 200 ksps, 8-bit a/d converter Datasheet

ADC084S021
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SNAS279E – APRIL 2005 – REVISED MARCH 2013
ADC084S021 4-Channel, 50 ksps to 200 Ksps, 8-Bit A/D Converter
Check for Samples: ADC084S021
FEATURES
1
•
•
•
•
2
Specified Over a Range of Sample Rates.
Four Input Channels
Variable Power Management
Single Power Supply with 2.7V - 5.25V Range
APPLICATIONS
•
•
•
Portable Systems
Remote Data Acquisition
Instrumentation and Control Systems
KEY SPECIFICATIONS
•
•
•
•
DNL: ±0.04 LSB (typ)
INL: ±0.04 LSB (typ)
SNR: 49.6 dB (typ)
Power Consumption
– 3V Supply: 1.6 mW (typ)
– 5V Supply: 5.8 mW (typ)
DESCRIPTION
The ADC084S021 is a low-power, four-channel
CMOS 8-bit analog-to-digital converter with a highspeed serial interface. Unlike the conventional
practice of specifying performance at a single sample
rate only, the ADC084S021 is fully specified over a
sample rate range of 50 ksps to 200 ksps. The
converter is based upon a successive-approximation
register architecture with an internal track-and-hold
circuit. It can be configured to accept up to four input
signals at inputs IN1 through IN4.
The output serial data is straight binary, and is
compatible with several standards, such as SPI™,
QSPI™, MICROWIRE, and many common DSP
serial interfaces.
The ADC084S021 operates with a single supply that
can range from +2.7V to +5.25V. Normal power
consumption using a +3V or +5V supply is 1.6 mW
and 5.8 mW, respectively. The power-down feature
reduces the power consumption to just 0.12 µW using
a +3V supply, or 0.35 µW using a +5V supply.
The ADC084S021 is packaged in a 10-lead VSSOP
package. Operation over the industrial temperature
range of −40°C to +85°C is ensured.
Table 1. Pin-Compatible Alternatives by Resolution and Speed
Resolution
Specified for Sample Rate Range of:
50 to 200 ksps
200 to 500 ksps
500 ksps to 1 Msps
12-bit
ADC124S021
ADC124S051
ADC124S101
10-bit
ADC104S021
ADC104S051
ADC104S101
8-bit
ADC084S021
ADC084S051
ADC084S101
1
2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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ADC084S021
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Connection Diagram
1
10
VA
2
9
DOUT
GND
3
8
DIN
CS
ADC084S021
SCLK
IN4
4
7
IN1
IN3
5
6
IN2
Figure 1. 10-Lead VSSOP
See DGK Package
Block Diagram
IN1
.
.
.
IN4
MUX
T/H
8-Bit
SUCCESSIVE
APPROXIMATION
ADC
VA
GND
GND
SCLK
CS
CONTROL
LOGIC
DIN
DOUT
Pin Descriptions and Equivalent Circuits
Pin No.
Symbol
Description
ANALOG I/O
4-7
IN1 to IN4
Analog inputs. These signals can range from 0V to VA.
DIGITAL I/O
10
SCLK
Digital clock input. This clock directly controls the conversion and readout processes.
9
DOUT
Digital data output. The output samples are clocked out at this pin on falling edges of the
SCLK pin.
8
DIN
Digital data input. The ADC084S021's Control Register is loaded through this pin on rising
edges of SCLK.
1
CS
Chip select. A conversion begins at the falling edge of CS. Conversions continue as long as
CS is held low.
2
VA
Positive supply pin. This pin should be connected to a quiet +2.7V to +5.25V source and be
bypassed to GND with a 0.1 µF monolithic capacitor located within 1 cm of the power pin
and with a 1 µF capacitor.
3
GND
POWER SUPPLY
Device ground return for all signals.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
2
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Absolute Maximum Ratings
(1) (2) (3)
−0.3V to 6.5V
Supply Voltage VA
Voltage on Any Pin to GND
−0.3V to VA +0.3V
(4)
±10 mA
Input Current at Any Pin
Package Input Current (4)
±20 mA
Power Consumption at TA = 25°C
See
(5)
(6)
ESD Susceptibility
Human Body Model
Machine Model
2500V
250V
Junction Temperature
+150°C
Storage Temperature
−65°C to +150°C
(1)
(2)
(3)
(4)
(5)
(6)
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see the
Electrical Characteristics. The ensured specifications apply only for the test conditions listed. Some performance characteristics may
degrade when the device is not operated under the listed test conditions.
All voltages are measured with respect to GND = 0V, unless otherwise specified.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
When the input voltage at any pin exceeds the power supply (that is, VIN < GND or VIN > VA), the current at that pin should be limited to
10 mA. The 20 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an
input current of 10 mA to two. The Absolute Maximum Rating specification does not apply to the VA pin. The current into the VA pin is
limited by the Analog Supply Voltage specification.
The absolute maximum junction temperature (TJmax) for this device is 150°C. The maximum allowable power dissipation is dictated by
TJmax, the junction-to-ambient thermal resistance (θJA), and the ambient temperature (TA), and can be calculated using the formula
PDMAX = (TJmax − TA)/θJA. The values for maximum power dissipation listed above will be reached only when the device is operated in
a severe fault condition (e.g. when input or output pins are driven beyond the power supply voltages, or the power supply polarity is
reversed). Obviously, such conditions should always be avoided.
Human body model is 100 pF capacitor discharged through a 1.5 kΩ resistor. Machine model is 220 pF discharged through zero ohms.
Operating Ratings
(1) (2)
−40°C ≤ TA ≤ +85°C
Operating Temperature Range
VA Supply Voltage
+2.7V to +5.25V
−0.3V to VA
Digital Input Pins Voltage Range
Clock Frequency
0.8 MHz to 3.2 MHz
Analog Input Voltage
(1)
(2)
0V to VA
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see the
Electrical Characteristics. The ensured specifications apply only for the test conditions listed. Some performance characteristics may
degrade when the device is not operated under the listed test conditions.
All voltages are measured with respect to GND = 0V, unless otherwise specified.
Package Thermal Resistance
Package
θJA
10-lead VSSOP
190°C / W
Soldering process must comply with Reflow Temperature Profile specifications. Refer to http://www.ti.com/packaging. (1)
(1)
Reflow temperature profiles are different for lead-free and non-lead-free packages.
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ADC084S021 Converter Electrical Characteristics
(1)
The following specifications apply for VA = +2.7V to 5.25V, GND = 0V, fSCLK = 0.8 MHz to 3.2 MHz, fSAMPLE = 50 ksps to 200
ksps, CL = 50 pF, unless otherwise noted. Boldface limits apply for TA = TMIN to TMAX: all other limits TA = 25°C.
Symbol
Parameter
Conditions
Typical
Limits
(2)
Units
STATIC CONVERTER CHARACTERISTICS
Resolution with No Missing Codes
8
Bits
±0.04
±0.2
LSB (max)
Differential Non-Linearity
±0.04
±0.2
LSB (max)
Offset Error
+0.52
±0.7
LSB (max)
Channel to Channel Offset Error Match
±0.01
±0.3
LSB (max)
Full-Scale Error
+0.51
±0.7
LSB (max)
Channel to Channel Full-Scale Error
Match
+0.01
±0.3
LSB (max)
INL
Integral Non-Linearity
DNL
VOFF
OEM
FSE
FSEM
DYNAMIC CONVERTER CHARACTERISTICS
SINAD
Signal-to-Noise Plus Distortion Ratio
VA = +2.7 to 5.25V
fIN = 39.9 kHz, −0.02 dBFS
49.6
49.1
dB (min)
SNR
Signal-to-Noise Ratio
VA = +2.7 to 5.25V
fIN = 39.9 kHz, −0.02 dBFS
49.6
49.2
dB (min)
THD
Total Harmonic Distortion
VA = +2.7 to 5.25V
fIN = 39.9 kHz, −0.02 dBFS
−76
−62
dB (max)
SFDR
Spurious-Free Dynamic Range
VA = +2.7 to 5.25V
fIN = 39.9 kHz, −0.02 dBFS
68
63
dB (min)
ENOB
Effective Number of Bits
VA = +2.7 to 5.25V
fIN = 39.9 kHz, −0.02 dBFS
7.9
7.9
Bits (min)
Channel-to-Channel Crosstalk
VA = +5.25V
fIN = 39.9 kHz
−73
dB
Intermodulation Distortion, Second
Order Terms
VA = +5.25V
fa = 40.161 kHz, fb = 41.015 kHz
−78
dB
Intermodulation Distortion, Third Order
Terms
VA = +5.25V
fa = 40.161 kHz, fb = 41.015 kHz
−73
dB
VA = +5V
11
MHz
VA = +3V
8
MHz
IMD
FPBW
-3 dB Full Power Bandwidth
ANALOG INPUT CHARACTERISTICS
VIN
Input Range
IDCL
DC Leakage Current
CINA
Input Capacitance
0 to VA
V
±1
µA (max)
Track Mode
33
pF
Hold Mode
3
pF
DIGITAL INPUT CHARACTERISTICS
VIH
Input High Voltage
VIL
Input Low Voltage
IIN
Input Current
CIND
Digital Input Capacitance
VA = +5.25V
2.4
V (min)
VA = +3.6V
2.1
V (min)
0.8
V (max)
VIN = 0V or VA
±10
µA (max)
2
4
pF (max)
ISOURCE = 200 µA
VA − 0.03
VA − 0.5
V (min)
ISOURCE = 1 mA
VA − 0.1
ISINK = 200 µA
0.03
0.4
V (max)
ISINK = 1 mA
0.1
±1
µA (max)
4
pF (max)
DIGITAL OUTPUT CHARACTERISTICS
VOH
Output High Voltage
VOL
Output Low Voltage
IOZH, IOZL TRI-STATE® Leakage Current
COUT
TRI-STATE® Output Capacitance
2
Output Coding
(1)
(2)
4
V
V
Straight (Natural) Binary
Min/max specification limits are specified by design, test, or statistical analysis.
Tested limits are specified to TI's AOQL (Average Outgoing Quality Level).
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ADC084S021 Converter Electrical Characteristics (1) (continued)
The following specifications apply for VA = +2.7V to 5.25V, GND = 0V, fSCLK = 0.8 MHz to 3.2 MHz, fSAMPLE = 50 ksps to 200
ksps, CL = 50 pF, unless otherwise noted. Boldface limits apply for TA = TMIN to TMAX: all other limits TA = 25°C.
Symbol
Parameter
Conditions
Typical
Limits
(2)
Units
POWER SUPPLY CHARACTERISTICS (CL = 10 pF)
VA
Supply Voltage
2.7
V (min)
5.25
V (max)
VA = +5.25V,
fSAMPLE = 200 ksps, fIN = 40 kHz
1.1
1.7
mA (max)
VA = +3.6V,
fSAMPLE = 200 ksps, fIN = 40 kHz
0.45
0.8
mA (max)
VA = +5.25V,
fSAMPLE = 0 ksps
200
nA
VA = +3.6V,
fSAMPLE = 0 ksps
200
nA
Power Consumption, Normal Mode
(Operational, CS low)
VA = +5.25V
5.8
8.9
mW (max)
VA = +3.6V
1.6
2.9
mW (max)
Power Consumption, Shutdown (CS
high)
VA = +5.25V
1.05
µW
VA = +3.6V
0.72
µW
Supply Current, Normal Mode
(Operational, CS low)
IA
Supply Current, Shutdown (CS high)
PD
AC ELECTRICAL CHARACTERISTICS
0.8
MHz (min)
3.2
MHz (max)
50
ksps (min)
fSCLK
Clock Frequency
(3)
fS
Sample Rate
(3)
tCONV
Conversion Time
DC
SCLK Duty Cycle
fSCLK = 3.2 MHz
70
% (max)
tACQ
Track/Hold Acquisition Time
Full-Scale Step Input
3
SCLK cycles
Throughput Time
Acquisition Time + Conversion Time
16
SCLK cycles
(3)
50
200
ksps (max)
13
SCLK cycles
30
% (min)
This is the frequency range over which the electrical performance is ensured. The device is functional over a wider range which is
specified under Operating Ratings.
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ADC084S021 Timing Specifications
The following specifications apply for VA = +2.7V to 5.25V, GND = 0V, fSCLK = 0.8 MHz to 3.2 MHz, fSAMPLE = 50 ksps to 200
ksps, CL = 50 pF, Boldface limits apply for TA = TMIN to TMAX: all other limits TA = 25°C.
Symbol
tCSU
Parameter
Conditions
Typical
Limits
(2)
Setup Time SCLK High to CS Falling Edge
(1)
10
(2)
VA = +5.0V
−0.5
VA = +3.0V
+4.5
VA = +5.0V
+1.5
VA = +3.0V
+4
VA = +5.0V
+2
VA = +3.0V
+16.5
VA = +5.0V
+15
Units
VA =
+3.0V
tCLH
Hold time SCLK Low to CS Falling Edge
tEN
Delay from CS Until DOUT active
tACC
Data Access Time after SCLK Falling Edge
tSU
Data Setup Time Prior to SCLK Rising Edge
tH
Data Valid SCLK Hold Time
tCH
SCLK High Pulse Width
0.5 x tSCLK 0.3 x tSCLK
ns (min)
tCL
SCLK Low Pulse Width
0.5 x tSCLK 0.3 x tSCLK
ns (min)
Output Falling
tDIS
CS Rising Edge to DOUT High-Impedance
Output Rising
(1)
(2)
10
ns (min)
30
ns (max)
30
ns (max)
+3
10
ns (min)
+3
10
ns (min)
VA = +3.0V
1.7
VA = +5.0V
1.2
VA = +3.0V
1.0
VA = +5.0V
1.0
20
ns (max)
Tested limits are specified to TI's AOQL (Average Outgoing Quality Level).
Clock may be either high or low when CS is asserted as long as setup and hold times tCSU and tCLH are strictly observed.
Timing Diagrams
Power Down
Power Up
Track
Power Up
Hold
Track
Hold
CS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
2
3
4
5
6
7
9
8
10
SCLK
Control register
Control register
DIN
DOUT
b7
b6
b5
b4
b3
b2
b1
DB7
DB6 DB5
b0
DB4
b7
DB3
DB2
DB1
b6
b5
DB0
b4
b3
b2
b1
b0
DB7
DB6
DB5
DB4
DB3
Figure 2. ADC084S021 Operational Timing Diagram
6
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Figure 3. Timing Test Circuit
CS
tCONVERT
tACQ
tCH
SCLK
1
2
3
4
tEN
6
7
Z3
tSU
Z2
Z1
11
8
12
13
14
15
tACC
tCL
DOUT
DIN
5
Z0
DB7
DB6
16
tDIS
DB5
DB1
DB4
Tri-State
DB0
Zero
Zero
Zero
Zero
tH
DONT DONTC ADD2
ADD1
ADD0
DONTC DONTC DONTC
Figure 4. ADC084S021 Serial Timing Diagram
CS
tCSU
SCLK
tCLH
SCLK
Figure 5. SCLK and CS Timing Parameters
Specification Definitions
ACQUISITION TIME is the time required to acquire the input voltage. That is, it is time required for the hold
capacitor to charge up to the input voltage.
APERTURE DELAY is the time between the fourth falling SCLK edge of a conversion and the time when the
input signal is acquired or held for conversion.
CONVERSION TIME is the time required, after the input voltage is acquired, for the ADC to convert the input
voltage to a digital word.
CROSSTALK is the coupling of energy from one channel into the other channel, or the amount of signal energy
from one analog input that appears at the measured analog input.
DIFFERENTIAL NON-LINEARITY (DNL) is the measure of the maximum deviation from the ideal step size of 1
LSB.
DUTY CYCLE is the ratio of the time that a repetitive digital waveform is high to the total time of one period. The
specification here refers to the SCLK.
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EFFECTIVE NUMBER OF BITS (ENOB, or EFFECTIVE BITS) is another method of specifying Signal-to-Noise
and Distortion or SINAD. ENOB is defined as (SINAD − 1.76) / 6.02 and says that the converter is
equivalent to a perfect ADC of this (ENOB) number of bits.
FULL POWER BANDWIDTH is a measure of the frequency at which the reconstructed output fundamental
drops 3 dB below its low frequency value for a full scale input.
FULL SCALE ERROR (FSE) is a measure of how far the last code transition is from the ideal 1½ LSB below
VREF+ and is defined as:
VFSE = Vmax + 1.5 LSB – VREF+
where
•
•
Vmax is the voltage at which the transition to the maximum code occurs
FSE can be expressed in Volts, LSB or percent of full scale range
(1)
GAIN ERROR is the deviation of the last code transition (111...110) to (111...111) from the ideal (VREF − 1.5
LSB), after adjusting for offset error.
INTEGRAL NON-LINEARITY (INL) is a measure of the deviation of each individual code from a line drawn from
negative full scale (½ LSB below the first code transition) through positive full scale (½ LSB above the last
code transition). The deviation of any given code from this straight line is measured from the center of that
code value.
INTERMODULATION DISTORTION (IMD) is the creation of additional spectral components as a result of two
sinusoidal frequencies being applied to the ADC input at the same time. It is defined as the ratio of the
power in the second and third order intermodulation products to the sum of the power in both of the
original frequencies. IMD is usually expressed in dB.
MISSING CODES are those output codes that will never appear at the ADC outputs. These codes cannot be
reached with any input value. The ADC084S021 is ensured not to have any missing codes.
OFFSET ERROR is the deviation of the first code transition (000...000) to (000...001) from the ideal (i.e. GND +
0.5 LSB).
SIGNAL TO NOISE RATIO (SNR) is the ratio, expressed in dB, of the rms value of the input signal at the
converter output to the rms value of the sum of all other spectral components below one-half the sampling
frequency, not including d.c. or harmonics included in the THD specification.
SIGNAL TO NOISE PLUS DISTORTION (S/N+D or SINAD) Is the ratio, expressed in dB, of the rms value of
the input signal to the rms value of all of the other spectral components below half the clock frequency,
including harmonics but excluding d.c.
SPURIOUS FREE DYNAMIC RANGE (SFDR) is the difference, expressed in dB, between the rms values of the
input signal and the peak spurious signal where a spurious signal is any signal present in the output
spectrum that is not present at the input, excluding d.c.
TOTAL HARMONIC DISTORTION (THD) is the ratio, expressed in dB or dBc, of the rms total of the first five
harmonic components at the output to the rms level of the input signal frequency as seen at the output.
THD is calculated as
THD = 20 ‡ log10
A f 22 +
+ A f 62
A f12
where
•
•
Af1 is the RMS power of the input frequency at the output
Af2 through Af6 are the RMS power in the first 5 harmonic frequencies
(2)
THROUGHPUT TIME is the minimum time required between the start of two successive conversion. It is the
acquisition time plus the conversion and read out times. In the case of the ADC084S021, this is 16 SCLK
periods.
8
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Typical Performance Characteristics
TA = +25°C, fSAMPLE = 50 ksps to 200 ksps, fSCLK = 0.8 MHz to 3.2 MHz, fIN = 39.9 kHz unless otherwise stated.
DNL - VA = 3.0V
INL - VA = 3.0V
Figure 6.
Figure 7.
DNL - VA = 5.0V
INL - VA = 5.0V
Figure 8.
Figure 9.
DNL vs. Supply
INL vs. Supply
Figure 10.
Figure 11.
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Typical Performance Characteristics (continued)
TA = +25°C, fSAMPLE = 50 ksps to 200 ksps, fSCLK = 0.8 MHz to 3.2 MHz, fIN = 39.9 kHz unless otherwise stated.
10
DNL vs. Clock Frequency
INL vs. Clock Frequency
Figure 12.
Figure 13.
DNL vs. Clock Duty Cycle
INL vs. Clock Duty Cycle
Figure 14.
Figure 15.
DNL vs. Temperature
INL vs. Temperature
Figure 16.
Figure 17.
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Typical Performance Characteristics (continued)
TA = +25°C, fSAMPLE = 50 ksps to 200 ksps, fSCLK = 0.8 MHz to 3.2 MHz, fIN = 39.9 kHz unless otherwise stated.
SNR vs. Supply
THD vs. Supply
Figure 18.
Figure 19.
SNR vs. Clock Frequency
THD vs. Clock Frequency
Figure 20.
Figure 21.
SNR vs. Clock Duty Cycle
THD vs. Clock Duty Cycle
Figure 22.
Figure 23.
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Typical Performance Characteristics (continued)
TA = +25°C, fSAMPLE = 50 ksps to 200 ksps, fSCLK = 0.8 MHz to 3.2 MHz, fIN = 39.9 kHz unless otherwise stated.
12
SNR vs. Input Frequency
THD vs. Input Frequency
Figure 24.
Figure 25.
SNR vs. Temperature
THD vs. Temperature
Figure 26.
Figure 27.
SFDR vs. Supply
SINAD vs. Supply
Figure 28.
Figure 29.
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Typical Performance Characteristics (continued)
TA = +25°C, fSAMPLE = 50 ksps to 200 ksps, fSCLK = 0.8 MHz to 3.2 MHz, fIN = 39.9 kHz unless otherwise stated.
SFDR vs. Clock Frequency
SINAD vs. Clock Frequency
Figure 30.
Figure 31.
SFDR vs. Clock Duty Cycle
SINAD vs. Clock Duty Cycle
Figure 32.
Figure 33.
SFDR vs. Input Frequency
SINAD vs. Input Frequency
Figure 34.
Figure 35.
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Typical Performance Characteristics (continued)
TA = +25°C, fSAMPLE = 50 ksps to 200 ksps, fSCLK = 0.8 MHz to 3.2 MHz, fIN = 39.9 kHz unless otherwise stated.
14
SFDR vs. Temperature
SINAD vs. Temperature
Figure 36.
Figure 37.
ENOB vs. Supply
ENOB vs. Clock Frequency
Figure 38.
Figure 39.
ENOB vs. Clock Duty Cycle
ENOB vs. Input Frequency
Figure 40.
Figure 41.
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Typical Performance Characteristics (continued)
TA = +25°C, fSAMPLE = 50 ksps to 200 ksps, fSCLK = 0.8 MHz to 3.2 MHz, fIN = 39.9 kHz unless otherwise stated.
ENOB vs. Temperature
Spectral Response - 3V, 200 ksps
Figure 42.
Figure 43.
Spectral Response - 5V, 200 ksps
Power Consumption vs. Throughput
Figure 44.
Figure 45.
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APPLICATIONS INFORMATION
ADC084S021 OPERATION
The ADC084S021 is a successive-approximation analog-to-digital converter designed around a chargeredistribution digital-to-analog converter. Simplified schematics of the ADC084S021 in both track and hold modes
are shown in Figure 46 and Figure 47, respectively. Figure 46 shows the ADC084S021 in track mode: switch
SW1 connects the sampling capacitor to one of four analog input channels through the multiplexer, and SW2
balances the comparator inputs. The ADC084S021 is in this state for the first three SCLK cycles after CS is
brought low.
Figure 47 shows the ADC084S021 in hold mode: switch SW1 connects the sampling capacitor to ground,
maintaining the sampled voltage, and switch SW2 unbalances the comparator. The control logic then instructs
the charge-redistribution DAC to add fixed amounts of charge to the sampling capacitor until the comparator is
balanced. When the comparator is balanced, the digital word supplied to the DAC is the digital representation of
the analog input voltage. The ADC084S021 is in this state for the fourth through sixteenth SCLK cycles after CS
is brought low.
The time when CS is low is considered a serial frame. Each of these frames should contain an integer multiple of
16 SCLK cycles, during which time a conversion is performed and clocked out at the DOUT pin and data is
clocked into the DIN pin to indicate the multiplexer address for the next conversion.
CHARGE
REDISTRIBUTION
DAC
IN1
MUX
SAMPLING
CAPACITOR
IN4
SW1
SW2
AGND
+
-
CONTROL
LOGIC
VA
2
Figure 46. ADC084S021 in Track Mode
CHARGE
REDISTRIBUTION
DAC
IN1
MUX
SAMPLING
CAPACITOR
IN4
SW1
SW2
AGND
+
-
CONTROL
LOGIC
VA
2
Figure 47. ADC084S021 in Hold Mode
USING THE ADC084S021
Figure 2 and Figure 4 for the ADC084S021 are shown in Timing Diagrams. CS is chip select, which initiates
conversions and frames the serial data transfers. SCLK (serial clock) controls both the conversion process and
the timing of serial data. DOUT is the serial data output pin, where a conversion result is sent as a serial data
stream, MSB first. Data at DIN, the serial data input pin, is written to the ADC084S021's Control Register. New
data is written to DIN with each conversion.
16
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A serial frame is initiated on the falling edge of CS and ends on the rising edge of CS. Each frame must contain
an integer multiple of 16 rising SCLK edges. The ADC output data (DOUT) is in a high impedance state when
CS is high and is active when CS is low. CS thus acts as an output enable, in addition to being a start
conversion input. Additionally, the device goes into a power down state when CS is high and between continuous
conversion cycles.
During the first 3 cycles of SCLK, the ADC is in the track mode, acquiring the input voltage. For the next 13
SCLK cycles the conversion is accomplished and the data is clocked out, MSB first, starting with the 5th clock. If
there is more than one conversion in a frame, the ADC will re-enter the track mode on the falling edge of SCLK
after the N*16th rising edge of SCLK, and re-enter the hold/convert mode at the N*16+4th falling edge of SCLK,
where "N" is an integer.
SCLK is internally gated off when CS is high. If SCLK is stopped in the low state while CS is high, the
subsequent fall of CS will generate a falling edge of the internal version of SCLK, putting the ADC into the track
mode. This is seen by the ADC as the first falling edge of SCLK. If SCLK is stopped with SCLK high, the ADC
enters the track mode at the first falling edge of SCLK after the falling edge of CS.
During each conversion, data is clocked into the device at the DIN pin on the first 8 rising edges of SCLK after
the fall of CS. For each conversion, it is necessary to clock in the data indicating the input that is selected for the
conversion after the current one. That is, the conversion that is started at the fall of CS is of the voltage at the
channel that was selected when the last conversion was started. The first conversion after power up will be of the
first channel. See Table 2, Table 3, and Table 4.
If CS and SCLK go low within the times defined by tCSU and tCLH, the rising edge of SCLK that begins clocking
data in at DIN may be one clock cycle later than expected. It is, therefore, best to strictly observe the minimum
tCSU and tCLH times given in ADC084S021 Timing Specifications .
There are no power-up delays or dummy conversions required with the ADC084S021. The ADC is able to
sample and convert an input to full conversion immediately following power up. The first conversion result after
power-up will be that of IN1.
Table 2. Control Register Bits
Bit 7 (MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
DONTC
DONTC
ADD2
ADD1
ADD0
DONTC
DONTC
DONTC
Table 3. Control Register Bit Descriptions
Bit #:
Symbol:
7 - 6, 2 - 0
DONTC
5
ADD2
4
ADD1
3
ADD0
Description
Don't care. The value of these bits do not affect device operation.
These three bits determine which input channel will be sampled and converted in the next
track/hold cycle. The mapping between codes and channels is shown in Table 4.
Table 4. Input Channel Selection
ADD2
ADD1
ADD0
Input Channel
x
0
0
IN1 (Default)
x
0
1
IN2
x
1
0
IN3
x
1
1
IN4
ADC084S021 TRANSFER FUNCTION
The output format of the ADC084S021 is straight binary. Code transitions occur midway between successive
integer LSB values. The LSB width for the ADC084S021 is VA/256 and the ideal transfer characteristic is shown
in Figure 48. The transition from an output code of 0000 0000 to a code of 0000 0001 is at 1/2 LSB, or a voltage
of VA/512. Other code transitions occur at steps of one LSB.
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111...111
111...000
|
|
ADC CODE
111...110
1LSB = VA/256
011...111
000...010
|
000...001
000...000
0V ½ LSB
ANALOG INPUT
+VA - 1 LSB
Figure 48. Ideal Transfer Characteristic
TYPICAL APPLICATION CIRCUIT
A typical application of the ADC084S021 is shown in Figure 50. Power is provided, in this example, by the Texas
Instruments LP2950 low-dropout voltage regulator, available in a variety of fixed and adjustable output voltages.
The power supply pin is bypassed with a capacitor network located close to the ADC084S021.
Because the reference for the ADC084S021 is the supply voltage, any noise on the supply will degrade device
noise performance. To keep noise off the supply, use a dedicated linear regulator for this device, or provide
sufficient decoupling from other circuitry to keep noise off the ADC084S021 supply pin. Because of the
ADC084S021's low power requirements, it is also possible to use a precision reference as a power supply to
maximize performance. The four-wire interface is also shown connected to a microprocessor or DSP.
LP2950
1 PF
VA
IN1
IN2
IN3
1 PF
0.1 PF
SCLK
ADC084S021
IN4
0.1 PF
5V
CS
DIN
MICROPROCESSOR
DSP
DOUT
GND
Figure 49. Typical Application Circuit
ANALOG INPUTS
An equivalent circuit for one of the ADC084S021's input channels is shown in Figure 50. Diodes D1 and D2
provide ESD protection for the analog inputs. At no time should any input go beyond (VA + 300 mV) or (GND −
300 mV), as these ESD diodes will begin conducting, which could result in erratic operation. For this reason,
these ESD diodes should NOT be used to clamp the input signal.
18
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The capacitor C1 in Figure 50 has a typical value of 3 pF, and is mainly the package pin capacitance. Resistor
R1 is the on resistance of the multiplexer and track / hold switch, which is typically 500 ohms. Capacitor C2 is the
ADC084S021 sampling capacitor, which is typically 30 pF. The ADC084S021 will deliver best performance when
driven by a low-impedance source to eliminate distortion caused by the charging of the sampling capacitance.
This is especially important when using the ADC084S021 to sample AC signals. Also important when sampling
dynamic signals is a band-pass or low-pass filter to reduce harmonics and noise, improving dynamic
performance.
VA
D1
R1
C2
30 pF
VIN
C1
3 pF
D2
Conversion Phase - Switch Open
Track Phase - Switch Closed
Figure 50. Equivalent Input Circuit
DIGITAL INPUTS AND OUTPUTS
The ADC084S021's digital output, DOUT, is limited by and cannot exceed the supply voltage, VA. The digital
input pins are not prone to latch-up and, and although not recommended, SCLK, CS and DIN may be asserted
before VA without any latchup risk.
POWER SUPPLY CONSIDERATIONS
The ADC084S021 is fully powered-up whenever CS is low, and fully powered-down when CS is high, with one
exception: the ADC084S021 automatically enters power-down mode between the 16th falling edge of a
conversion and the 1st falling edge of the subsequent conversion (see Timing Diagrams).
The ADC084S021 can perform multiple conversions back to back; each conversion requires 16 SCLK cycles.
The ADC084S021 will perform conversions continuously as long as CS is held low.
Power Management
When the ADC084S021 is operated continuously in normal mode, the maximum throughput is fSCLK/16.
Performance will remain as stated in ADC084S021 Electrical Characteristics as long as the SCLK frequency
remains within the range stated at the heading of those tables. Throughput may be traded for power consumption
by running fSCLK at its maximum 3.2 MHz and performing fewer conversions per unit time, putting the
ADC084S021 into shutdown mode between conversions. Figure 45 is shown in Typical Performance
Characteristics. To calculate the power consumption for a given throughput, multiply the fraction of time spent in
the normal mode by the normal mode power consumption and add the fraction of time spent in shutdown mode
multiplied by the shutdown mode power consumption. Generally, the user will put the part into normal mode and
then put the part back into shutdown mode. Note that the curve of Figure 45 is nearly linear. This is because the
power consumption in the shutdown mode is so small that it can be ignored for all practical purposes.
Power Supply Noise Considerations
The charging of any output load capacitance requires current from the power supply, VA. The current pulses
required from the supply to charge the output capacitance will cause voltage variations of the supply voltage. If
these variations are large enough, they could degrade SNR and SINAD performance of the ADC. Furthermore,
discharging the output capacitance when the digital output goes from a logic high to a logic low will dump current
into the die substrate. Load discharge currents will cause "ground bounce" noise in the substrate that will
degrade noise performance if that current is large enough. The larger is the output capacitance, the more current
flows through the die supply line and substrate, causing more noise to be coupled into the analog channel and
degrading noise performance.
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To keep noise out of the power supply, keep the output load capacitance as small as practical. If the load
capacitance is greater than 50 pF, use a 100 Ω series resistor at the ADC output, located as close to the ADC
output pin as practical. This will limit the charge and discharge current of the output capacitance and improve
noise performance.
20
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REVISION HISTORY
Changes from Revision D (March 2013) to Revision E
•
Page
Changed layout of National Data Sheet to TI format .......................................................................................................... 20
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PACKAGE OPTION ADDENDUM
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23-Sep-2013
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
ADC084S021CIMM
ACTIVE
VSSOP
DGS
10
ADC084S021CIMM/NOPB
ACTIVE
VSSOP
DGS
10
ADC084S021CIMMX
ACTIVE
VSSOP
DGS
10
ADC084S021CIMMX/NOPB
ACTIVE
VSSOP
DGS
10
1000
3500
Eco Plan
Lead/Ball Finish
(2)
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
TBD
Call TI
Call TI
-40 to 85
X19C
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 85
X19C
TBD
Call TI
Call TI
-40 to 85
X19C
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 85
X19C
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
Addendum-Page 1
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PACKAGE OPTION ADDENDUM
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In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
23-Sep-2013
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
B0
(mm)
K0
(mm)
P1
(mm)
W
Pin1
(mm) Quadrant
ADC084S021CIMM/NOPB VSSOP
DGS
10
1000
178.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
ADC084S021CIMMX/NOP VSSOP
B
DGS
10
3500
330.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
23-Sep-2013
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
ADC084S021CIMM/NOPB
VSSOP
DGS
10
1000
210.0
185.0
35.0
VSSOP
DGS
10
3500
367.0
367.0
35.0
ADC084S021CIMMX/NOP
B
Pack Materials-Page 2
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