MAX1080 Datasheet, PDF (22/24 Pages) Maxim Integrated Products – 300ksps/400ksps, Single-Supply, Low-Power, 8-Channel, Serial 10-Bit ADCs with Internal Reference

300ksps/400ksps, Single-Supply, Low-Power,
8-Channel, Serial 10-Bit ADCs with Internal Reference
CS
SCLK
DIN
SSTRB
DOUT
START SEL2 SEL1 SEL0 UNI/BIP SGI/DIF PD1 PD0
MSB B8 S1 S0
HIGH IMPEDANCE
HIGH IMPEDANCE
Figure 19. MAX1080/MAX1081-to-TMS320 Serial Interface
Signal-to-Noise Plus Distortion (SINAD)
SINAD is the ratio of the fundamental input frequency’s
RMS amplitude to RMS equivalent of all other ADC out-
put signals:
SINAD (dB) = 20 ✕ log (Signal_RMS / Noise_RMS)
Effective Number of Bits (ENOB)
ENOB indicates the global accuracy of an ADC at a
specific input frequency and sampling rate. An ideal
ADC’s error consists only of quantization noise. With an
input range equal to the ADC’s full-scale range, calcu-
late ENOB as follows:
ENOB = (SINAD - 1.76) / 6.02
Total Harmonic Distortion (THD)
THD is the ratio of the RMS sum of the input signal’s
first five harmonics to the fundamental itself. This is
expressed as:

THD = 20 × log ^
V₂₂
+
V₃₂
+
V₄₂
+
V₄₂
+
V₅₂


V₁
where V₁ is the fundamental amplitude, and V₂ through
V₅ are the amplitudes of the 2nd- through 5th-order
harmonics.
Spurious-Free Dynamic Range (SFDR)
SFDR is the ratio of the RMS amplitude of the funda-
mental (maximum signal component) to the RMS value
of the next-largest distortion component.
Ordering Information (continued)
PART
TEMP.
RANGE
MAX1080BEUP -40°C to +85°C
MAX1081ACUP 0°C to +70°C
MAX1081BCUP 0°C to +70°C
MAX1081AEUP -40°C to +85°C
MAX1081BEUP -40°C to +85°C
PIN-
PACKAGE
20 TSSOP
20 TSSOP
20 TSSOP
20 TSSOP
20 TSSOP
INL
(LSB)
±1
±1/2
±1
±1/2
±1
Typical Operating Circuit
0 TO
+2.5V
ANALOG
INPUTS
4.7µF
0.01µF
CH0
V_DD1
V_DD2
MAX1080 _GND
MAX1081
CH7
COM
REF
CS
SCLK
DIN
REFADJ ^DOUT
SSTRB
SHDN
+5V OR
+3V
V_DD
0.1µF
CPU
I/O
SCK (SK)
MOSI (SO)
MISO (SI)
V_DD2
V_SS
Chip Information
TRANSISTOR COUNT: 4286
PROCESS: BiCMOS
22 ______________________________________________________________________________________