CS5560-ISZ Cirrus Logic Inc, CS5560-ISZ Datasheet - Page 15

• Manufacturer Part Number: CS5560-ISZ
• Description: IC ADC 24BIT 1CH 50KSPS 24SSOP
• Manufacturer: Cirrus Logic Inc

Specifications of CS5560-ISZ

• Number Of Converters: 1
• Package / Case: 24-SSOP
• Number Of Bits: 24
• Data Interface: Serial
• Power Dissipation (max): 85mW
• Voltage Supply Source: Dual ±
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Number Of Adc Inputs: 1
• Architecture: Delta-Sigma
• Conversion Rate: 5 KSPs
• Resolution: 24 bit
• Input Type: Voltage
• Interface Type: Serial (3-Wire, 4-Wire)
• Voltage Reference: 2.5 V
• Supply Voltage (max): 5 V
• Supply Voltage (min): 2.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Input Voltage: 2.5 V to 5 V
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 598-1277 - KIT BOARD FOR CDB5560 ADC598-1273 - DEV BOARD FOR CS5560 W/MUX
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 598-1265-5

3.2 Clock
The CS5560 can be operated from its internal oscillator or from an external master clock. The state of
MCLK determines which clock source will be used. If MCLK is tied low, the internal oscillator will start and
be used as the clock source for the converter. If an external CMOS-compatible clock is input into MCLK
the converter will power down the internal oscillator and use the external clock. If the MCLK pin is held
high, the internal oscillator will be held in the stopped state. The MCLK input can be held high to delete
clock cycles to aid in synchronizing multiple converters in different phase relationships.
The internal oscillator can be used if the signals to be measured are essentially DC. The internal oscillator
exhibits jitter at about 500 picoseconds rms. If the CS5560 is used to digitize AC signals, an external
low-jitter clock source should be used.
If the internal oscillator is used as the clock for the CS5560, the maximum conversion rate will be dictated
by the oscillator frequency.
If driven from an external MCLK source, the fast rise and fall times of the MCLK signal can result in clock
coupling from the internal bond wire of the IC to the analog input. Adding a 50 ohm resistor on the external
MCLK source significantly reduces this effect.
3.3 Voltage Reference
The voltage reference for the CS5560 can range from 2.4 volts to 4.2 volts. A 4.096 volt reference is re-
quired to achieve the specified performance.
reference with either a single +5 V analog supply or with ±2.5 V.
For optimum performance, the voltage reference device should be one that provides a capacitor connec-
tion to provide a means of noise filtering, or the output should include some type of bandwidth-limiting fil-
ter. Some 4.096 volt reference devices need only 5 volts total supply for operation and can be connected
as shown in
output capacitor.
Some older 4.096 voltage reference designs require more headroom and must operate from an input volt-
age of 5.5 to 6.5 volts. If this type of voltage reference is used ensure that when power is applied to the
system, the voltage reference rise time is slower than the rise time of the V1+ and V1- power supply volt-
age to the converter. An example circuit to slow the output startup time of the reference is illustrated in
Figure
DS713PP2
5.
Figure 6
or
5.5 to 15 V
Figure
10μF
2k
7. The reference should have a local bypass capacitor and an appropriate
Figure 5. Voltage Reference Circuit
GND
VIN
VOUT
Figure 6
5/4/09
4.096 V
Refer to V1- and VREF1 pins.
and
Figure 7
illustrate the connection of the voltage
CS5560
15