AN35 Application Note The CS5504 Family Characteristics Table 1 summarizes the similarities differences of the CS5504 family. The CS5504/5/6/7/8/9 are a series of A/D converters all derived from a high performance ∆Σ architecture. The CS5504 family members are based on a core architecture including both an analog modulator and a digital filter, with only subtle differences between the individual products. The digital filter has been optimized to attenuate ac line interference (50/60 Hz and their harmonics) when the devices are operated from a low-cost 32.768kHz crystal. The CS5504/9 come in smaller packages than the CS5505/6/7/8, however, the CS5505/6/7/8 have more functionality and flexibility. The CS5505/6/7/8 offer a sleep function, an on-chip voltage reference, and multiple serial communication modes. Table 2 shows the CS5504 family’s wide array of power supply options. Note: the CS5509 is single supply, however, the VA+ supply for all devices must always be the most positive operating voltage under all operating conditions, including start-up. The use of a low-cost 32.768kHz clock provides 20 samples per second from the family. The CS5505/6/7/8 can achieve up to 100 samples/second with a 163kHz system clock, while the CS5504/9 can achieve up to 200 samples/second when operated from it’s maximum input clock of 330 kHz. In achieving higher conversion rates, the CS5504 requires slightly higher operating currents than the CS5505/6/7/8. The CS5509 achieves the same high conversion rate as the CS5504 with lower power consumption, but pays a slight penalty in linearity. CS5504 CS5505 CS5506 CS5507 CS5508 CS5509 Max. Resolution #Channels Speed3 20-bits 21 200 16-bits 42 100 20-bits 42 100 1 16-bits 1 100 20-bits 11 100 16-bits 11 200 and CS5504/5/ 6/7/8 CS5509 VA+ +5 to +10V +5V +5V +5V +5V VA0V 0 to -5V 0 to -5V - VD+ +5V +5V +3.3V +5V +3.3V Table 2. Power Supply Arrangements 4 Linearity (Typical) 0.0007% 0.0015% 0.0007% 0.0015% 0.0007% 0.0015% Sleep Power No 4.4 mW Yes 3 mW Yes 3 mW Yes 3 mW Yes 3 mW No 1.7 mW On-chip Serial Port VREF Modes5 Pin Count No SEC 20 Yes SEC, SSC 24 Yes SEC, SSC 24 Yes SEC, SSC 20 Yes SEC, SSC 20 No SEC 16 Table 1. CS5504 Family Characteristics Notes: 1. Fully-differential 2. Pseudo-differential 3. CS5509 is production tested at 330 kHz (200 samples/second) All others are production tested at 32.768 kHz for the best 50/60 Hz rejection. 4. These linearity specifications are based on a 20Hz output rate using a 32.768kHz crystal. 5. SEC is synchronous external clocking of the data out while SSC is synchronous self-clocking. Crystal Semiconductor Corporation P.O. Box 17847, Austin, TX 78760 (512) 445-7222 FAX 445-7581 http://www.crystal.com Copyright Crystal Semiconductor Corporation 1996 (All Rights Reserved) JAN ’95 AN35REV2 1